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—theomaniac /thee'oh may"nee ak'/, n. /thee'oh may"nee euh, -mayn"yeuh/, n. a delusional mental illness in which a person believes himself or herself to be God or specially ...
—theomorphism, n. /thee'euh mawr"fik/, adj. having the form or likeness of God or a deity. [1865-70; < Gk theómorph(os) (see THEO-, -MORPHOUS) + -IC; see -MORPHIC] * * *
the·o·mor·phism (thē'ō-môrʹfĭz'əm) n. Depiction or conception of humans as having the form of a god.   the'o·morʹphic adj. * * *
theonomous [thē än′ə məs] adj. 〚
—theonomous, adj. /thee on"euh mee/, n. the state of an individual or society that regards its own nature and norms as being in accord with the divine nature. Cf. ...
—theopathetic /thee'oh peuh thet"ik/, theopathic /thee'euh path"ik/, adj. /thee op"euh thee/, n. religious emotion excited by the contemplation of God. [1740-50; THEO- + ...
Theophanes the Confessor, Saint
▪ Byzantine monk born c. 752 died c. 818, island of Samothrace, Greece; feast day March 12       Byzantine monk, theologian, and chronicler, a principal adversary of ...
Theophanes The Greek
▪ Byzantine painter born c. 1330, /40 died 1405       one of the leading late Byzantine painters of murals, icons, and miniatures who influenced the 15th-century ...
—theophanic /thee'euh fan"ik/, theophanous, adj. /thee of"euh nee/, n., pl. theophanies. a manifestation or appearance of God or a god to a person. [1625-35; < LL theophania < ...
Theophilo Ottoni
/ti aw"fi loo oo taw"nee/. See Teófilo Otoni. * * *
/thee of"euh leuhs/, n. 1. a walled plain in the 4th quadrant of the face of the moon: about 65 mi. (105 km) in diameter. 2. a male given name. * * * (as used in ...
Theophilus (Presbyter)
pseudonym of Roger of Helmarshausen flourished 12th century German monk and writer. He is known for his De Diversis Artibus (с 1110–40), a thorough account of the ...
Theophilus of Alexandria, Saint
▪ Egyptian theologian flourished 5th century; feast day, Egyptian Coptic Church, October 15; in the Syrian Church, October 17       theologian and patriarch of ...
Theophilus Of Antioch
▪ Syrian saint born , near Tigris and Euphrates rivers, modern Iraq died April 180, Antioch, modern Antakya, Tur.       Syrian saint, sixth bishop of Antioch, and ...
—Theophrastian /thee'euh fras"cheuhn/, adj. /thee'euh fras"teuhs/, n. 372?-287 B.C., Greek philosopher. * * * ▪ Greek philosopher born c. 372 BC, , Eresus, Lesbos died c. ...
Theophylactus Of Ochrida
▪ Greek archbishop also spelled  Theophylact Of Ohrid   born c. 1050, , Euboea, Aegean island of Greece died c. 1109       Greek Orthodox archbishop of Ochrida ...
Theophylactus Simocattes
▪ Byzantine historian also spelled Theophylact Simocatta born , Egypt died after 640, , probably Constantinople       Byzantine historian whose chronicles of the ...
/thee'euh fil"een, -in/, n. Pharm. a white, crystalline, poisonous alkaloid, C7H8N4O2, an isomer of theobromine, extracted from tea leaves or produced synthetically: used to ...
theophylline ethylenediamine
/eth"euh leen duy"euh meen', -duy am"in/, Pharm. aminophylline. [ETHYLENE + DIAMINE] * * *
Theopompus of Chios
▪ Greek historian born 378/377 BC, Chios, Ionia [Greece] died c. 320 BC, Alexandria, Egypt       Greek historian and rhetorician whose Philippica, though lost in its ...
theorem. * * *
—theorbist, n. /thee awr"boh/, n., pl. theorbos. an obsolete bass lute with two sets of strings attached to separate peg boxes, one above the other, on the neck. [1595-1605; < ...
/tay"oh rddel'/, n. Axel Hugo Teodor /ahk"seuhl hooh"goh te"oh dawrdd'/, 1903-82, Swedish biochemist: Nobel prize for medicine 1955. * * *
Theorell, Axel Hugo Teodor
▪ Swedish biochemist born July 6, 1903, Linköping, Sweden died Aug. 15, 1982, Stockholm       Swedish biochemist whose study of enzymes (enzyme) that facilitate ...
—theorematic /thee'euhr euh mat"ik, thear'euh-/, adj. —theorematically, adv. /thee"euhr euhm, thear"euhm/, n. 1. Math. a theoretical proposition, statement, or formula ...
theorem of the mean
Math. See mean value theorem. * * *
—theoretically, adv. /thee'euh ret"i keuhl/, adj. 1. of, pertaining to, or consisting in theory; not practical (distinguished from applied). 2. existing only in theory; ...
theoretical arithmetic
arithmetic (def. 2). * * *
See theoretical. * * *
/thee'euhr i tish"euhn, thear'i-/, n. a person who deals with or is expert in the theoretical side of a subject: a military theoretician. [1885-90; THEORETIC(S) + -IAN] * * *
/thee'euh ret"iks/, n. (used with a sing. v.) the theoretical or speculative part of a science or subject. [1650-60; theoret(ic) (see THEORETICAL) + -ICS] * * *
/thee"euhr ist, thear"-/, n. 1. a person who theorizes. 2. a person who deals mainly with the theory of a subject: a theorist in medical research. [1585-95; THEOR(Y) + -IST] * * *
See theorize. * * *
—theorization, n. —theorizer, n. /thee"euh ruyz', thear"uyz/, v., theorized, theorizing. v.i. 1. to form a theory or theories. v.t. 2. to form a theory or theories ...
See theorization. * * *
/thee"euh ree, thear"ee/, n., pl. theories. 1. a coherent group of general propositions used as principles of explanation for a class of phenomena: Einstein's theory of ...
theory of equations
Math. the branch of mathematics dealing with methods of finding the solutions to algebraic equations. [1790-1800] * * *
Theory of Everything
a theory intended to show that the electroweak, strong, and gravitational forces are components of a single quantized force. [1985-90] * * *
theory of games
theory of games n. GAME THEORY * * *
theory of games.
See game theory. [1950-55] * * *
theory of numbers.
See number theory. [1805-15] * * *
theory of relativity
Physics. relativity (def. 2). [1960-65] * * *
theoryof games
theory of games n. See game theory. * * *
1. theosophical. 2. theosophy. * * *
See theosophy. * * *
See theosophic. * * *
Theosophical Society
a society founded by Madame Blavatsky and others, in New York in 1875, advocating a worldwide eclectic religion based largely on Brahmanic and Buddhistic teachings. * * *
See theosophic. * * *
See theosophic. * * *
—theosophical /thee'euh sof"i keuhl/, theosophic, adj. —theosophically, adv. —theosophism, n. —theosophist, n. /thee os"euh fee/, n. 1. any of various forms of ...
Gk. /the'aw taw kaw"pooh laws/, n. Domenikos /dhaw men"ee kaws/. See El Greco. * * *
Theotokás, Yórgos
▪ Greek author Yórgos also spelled  Geórgios   born Aug. 27, 1906, Constantinople, Ottoman Empire [now Istanbul, Tur.] died Oct. 30, 1966, Athens, ...
Theotókis, Konstantínos
▪ Greek author born May 1872, Corfu, Greece died July 1, 1923, Corfu       Greek novelist of the realist school, whose clear and pure Demotic Greek was flavoured by ...
/thee'euh tok"euhs/, n. a title of the Virgin Mary as the Mother of the incarnate Son of God. Also, Theotocos. [1870-75; < LGk Theotókos, equiv. to theo- THEO- + -tokos giving ...
/thear"euh/, n. a Greek island in the S Aegean, in the Cyclades group. 30 sq. mi. (78 sq. km). Also, Thira. Also called Santorin, Santorini. * * * ▪ island, Greece Modern ...
/thear"euh luyt'/, n. a coarse-grained, phaneritic rock composed of labradorite, nepheline, and augite. [ < Gk théra hunting + -LITE; said to be so called because success in ...
died 404/403 BC, Athens Athenian politician. In 411 he helped install the Council of the Four Hundred. Sent to quell an insurrection at Piraeus, he instead led the mutineers in ...
(Greek; "Worshipers") Sect of Jewish ascetics believed to have settled along Lake Mareotis near Alexandria in the 1st century AD. Their origin and fate are unknown, and the ...
—therapeutically, adv. /ther'euh pyooh"tik/, adj. Also, therapeutical. 1. of or pertaining to the treating or curing of disease; curative. n. 2. a therapeutic ...
therapeutic abortion
abortion performed when a woman's pregnancy endangers her health. * * *
therapeutic index
Pharm. the ratio between the dosage of a drug that causes a lethal effect and the dosage that causes a therapeutic effect. Also called margin of safety. [1925-30] * * *
therapeutic abortion n. Termination of pregnancy as a medical necessity, either to save the mother's life or preserve her health. * * *
See therapeutic. * * *
therapeutic index n. The ratio between the toxic dose and the therapeutic dose of a drug, used as a measure of the relative safety of the drug for a particular treatment. * * *
/ther'euh pyooh"tiks/, n. (used with a sing. v.) the branch of medicine concerned with the remedial treatment of disease. [1665-75; see THERAPEUTIC, -ICS] * * * Treatment and ...
See therapeutics. * * *
/ther"euh pist/, n. 1. a person trained in the use of physical methods, as exercises, heat treatments, etc., in treating or rehabilitating the sick or wounded or helping patients ...
/theuh rap"sid/, n. 1. any of various groups of mammallike reptiles of the extinct order Therapsida, inhabiting all continents from mid-Permian to late Triassic times, some of ...
/ther"euh pee/, n., pl. therapies. 1. the treatment of disease or disorders, as by some remedial, rehabilitating, or curative process: speech therapy. 2. a curative power or ...
/ther'euh vah"deuh/, n. Buddhism. Hinayanist name for Hinayana. * * * Major form of Buddhism, prevalent in Myanmar, Sri Lanka, Thailand, Cambodia, and Laos. It is the only ...
/ther'euh vahd"n/, n. Buddhism. Hinayanist. * * *
/therr"blig/, n. (in time and motion study) any of the basic elements involved in completing a given manual operation or task that can be subjected to analysis. [1930-35, Amer.; ...
/dhair/; unstressed /dheuhr/, adv. 1. in or at that place (opposed to here): She is there now. 2. at that point in an action, speech, etc.: He stopped there for applause. 3. in ...
There is a green hill far away
the first line of a well-known Christian hymn traditionally sung at Easter. * * *
There was an old woman
the first line of a well-known children’s nursery rhyme. The full rhyme is: There was an old woman who lived in a shoe. She had so many children she didn’t know what to ...
/dhairz/ 1. contraction of there is: There's the hotel we were looking for. 2. contraction of there has: There's been entirely too much said on the subject. Usage. See ...
/dhair"euh bowt', dhair'euh bowt"/, adv. 1. about or near that place or time: last June or thereabout. 2. about that number, amount, etc. Also, thereabouts. [bef. 950; ME ther ...
thereabouts [ther′ə bouts΄] adv. 1. near that place 2. near that time or point in action, speech, etc. 3. near that number, amount, degree, etc.: Also thereabout * * ...
/dhair'af"teuhr, -ahf"-/, adv. 1. after that in time or sequence; afterward: Thereafter they did not speak. 2. Obs. accordingly. [bef. 900; ME ther after, OE thaer aefter. See ...
thereagainst [ther΄ə genst′] adv. against or contrary to that; in opposition * * * there·a·gainst (thâr'ə-gĕnstʹ) adv. Against or in opposition to that. * * *
/dhair'at"/, adv. 1. at that place or time; there: Seeing the gate, they entered thereat. 2. because of that; thereupon. [bef. 900; ME ther at, OE thaer aet. See THERE, AT1] * * *
/dhair'buy", dhair"buy'/, adv. 1. by that; by means of that. 2. in that connection or relation: Thereby hangs a tale. 3. by or near that place. 4. Scot. about that number, ...
/dhair'fawr"/, adv. for or in exchange for that or this; for it: a refund therefor. [1125-75; ME therfor. See THERE, FOR] * * *
/dhair"fawr', -fohr'/, adv. in consequence of that; as a result; consequently: I think; therefore I am. [1125-75; ME ther(e)fore, var. of therfor THEREFOR] Syn. hence, whence. ...
/dhair'frum", -from"/, adv. from that place, thing, etc. [1200-50; ME; see THERE, FROM] * * *
/dhair'in"/, adv. 1. in or into that place or thing. 2. in that matter, circumstance, etc. [bef. 1000; ME therin, OE thaerin. See THERE, IN] * * *
/dhair'in af"teuhr, -ahf"-/, adv. afterward in that document. [1810-20; THEREIN + AFTER] * * *
/dhair'in"tooh, dhair'in tooh"/, adv. 1. into that place or thing. 2. into that matter, circumstance, etc. [1250-1300; ME thar into. See THERE, INTO] * * *
—thereminist, n. /ther"euh min/, n. a musical instrument with electronic tone generation, the pitch and tone volume being controlled by the distance between the player's hands ...
Theremin, Leon
▪ 1994       (LEV SERGEYEVICH TERMEN), Russian scientist and inventor (b. Aug. 24, 1896, St. Petersburg, Russia—d. Nov. 3, 1993, Moscow, Russia), created one of the ...
/dhair'uv", -ov"/, adv. 1. of that or it. 2. from or out of that origin or cause. [bef. 1000; ME therof, OE thaerof. See THERE, OF1] * * *
/dhair'on", -awn"/, adv. 1. on or upon that or it. 2. immediately after that; thereupon. [bef. 900; ME ther on, OE thaeron. See THERE, ON] * * *
/teuh ree"seuh, -zeuh/; Sp. /te rdde"sah/, n. 1. Saint. Also, Teresa. Also called Theresa of Avila /ah"vee lah'/. 1515-82, Spanish Carmelite nun, mystic, and writer. 2. a female ...
The·re·sa or Te·re·sa (tə-rēʹsə, -zə, -rāʹ-), Saint Known as “Theresa of Ávila.” 1515-1582. Spanish nun and mystical writer who founded the reformed order of ...
Thérèse [lē zyö′tā rez′; ] E [ tə rēs′] Saint (1873-97); Fr. Carmelite nun: her day is Oct. 3: called Thérèse of Lisieux [lē zyö′] * * * (as used in ...
Thérèse de Lisieux
/tay rddez deuh lee zyue"/, n. Saint (Marie Françoise Thérèse Martin) ("the Little Flower"), 1873-97, French Carmelite nun. * * *
Thérèse de Lisieux,Saint
Thé·rèse de Li·sieux (tā-rĕz' də lē-zyœʹ), Saint Known as “the Little Flower.” 1873-1897. French nun whose autobiography, Story of a Soul (1898), recounts her ...
Thérèse of Lisieux, Saint
orig. Marie-Françoise-Thérèse Martin born Jan. 2, 1873, Alençon, France died Sept. 30, 1897, Lisieux; canonized May 17, 1925; feast day October 1 French Carmelite nun and ...
Nazi concentration camp in World War II. Originally a town in northern Bohemia (now in the Czech Republic), it became a walled ghetto for Jews in 1941. After the small ...
/dhair'tooh"/, adv. 1. to that place, thing, etc. 2. to that matter, circumstance, etc. Also, thereunto /dhair'un tooh", dhair'un"tooh/. [bef. 900; ME therto, OE thaerto. See ...
/dhair'teuh fawr", -fohr"/, adv. before or until that time. [1300-50; ME ther tofore. See THERE, HERETOFORE] * * *
/dhair'un"deuhr/, adv. 1. under or beneath that. 2. under the authority of or in accordance with that. [bef. 900; ME therunder, OE thaerunder. See THERE, UNDER] * * *
there·un·to (thâr'ŭn-to͞oʹ) adv. Archaic To that, this, or it; thereto. * * *
/dhair"euh pon', -pawn', dhair'euh pon", -pawn"/, adv. 1. immediately following that. 2. in consequence of that. 3. upon that or it. 4. with reference to that. [1125-75; ME ther ...
/dhair'with", -widh"/, adv. 1. with that. 2. in addition to that. 3. following upon that; thereupon. [bef. 900; ME ther(e)with, OE thaerwith. See THERE, WITH] * * *
/dhair'widh awl", -with-, thair"widh awl', -with-/, adv. 1. together with that; in addition to that. 2. following upon that. [1250-1300; ME ther withal. See THERE, WITHAL] * * *
Port. /ti rddi zee"nah/, n. former name of Teresina. * * *
—theriacal, adj. /thear"ee ak'/, n. 1. molasses; treacle. 2. a paste formerly used as an antidote to poison, esp. snake venom, made from 60 or 70 different drugs pulverized and ...
/thear"ee euhn/, adj. 1. (in some classification systems) belonging or pertaining to the group Theria, comprising the marsupial and placental mammals and their extinct ...
—therianthropism /thear'ee an"threuh piz'euhm/, n. /thear'ee an throp"ik/, adj. 1. being partly bestial and partly human in form. 2. of or pertaining to deities conceived or ...
/thear'ee a"triks/, n. (used with a sing. v.) the study and practice of veterinary medicine. [ < Gk ther-, comb. form of thér beast, carnivore + -IATRICS] * * *
Thériault, Yves
▪ Canadian writer born Nov. 28, 1916, Quebec City, Que., Can. died Oct. 20, 1983, Rawdon, Que.       one of the most prolific writers in Canada, with some 1,300 radio ...
/theuh rid"ee id, ther'i duy"id/, n. 1. a spider of the family Theridiidae, comprising the comb-footed spiders. adj. 2. belonging or pertaining to the family Theridiidae. [ < NL ...
/thear'ee oh jeuh nol"euh jee/, n. the branch of veterinary medicine encompassing all aspects of reproduction. [ < Gk therí(on) beast + -O- + Gk gén(os) offspring, sex + -O- + ...
—theriomorph, n. /thear'ee euh mawr"fik/, adj. (of deities) thought of or represented as having the form of beasts. Also, theriomorphous. [1880-85; < Gk theriómorph(os) ...
/therrm/, n. Physics. any of several units of heat, as one equivalent to 1000 large calories or 100,000 British thermal units. Also, therme. [1885-90; < Gk thérme heat] * * *
var. of thermo- before a vowel: thermesthesia. * * *
thermometer. * * *
/therr"meuh/, n. ancient name of Salonika. * * *
/therr"mee/, n. (used with a pl. v.) 1. hot springs; hot baths. 2. a public bathing establishment of the ancient Greeks or Romans. [1590-1600; < L < Gk thérmai; n. use of pl. of ...
/therrm'is thee"zheuh, -zhee euh, -zee euh/, n. thermesthesia. * * *
Thérmai, Gulf of
▪ gulf, Greece Modern Greek  Thermaïkós Kólpos , English  Thermaic Gulf        large gulf of the Aegean Sea in northeastern Greece between Thessaly, Macedonia, ...
—thermally, adv. /therr"meuhl/, adj. 1. Also, thermic. of, pertaining to, or caused by heat or temperature: thermal capacity. 2. of, pertaining to, or of the nature of thermae: ...
thermal analysis
Chem. any analysis of materials in which properties relating to heat, such as freezing and boiling temperatures, the heat of fusion, the heat of vaporization, etc., are measured. ...
thermal barrier
Aeron., Rocketry. the high temperatures produced by the friction between a supersonic object and the earth's atmosphere that limit the speed of an airplane or rocket. Also called ...
thermal conduction
Transfer of heat energy resulting from differences in temperature between adjacent bodies or adjacent parts of a body. In the absence of a heat pump, the energy will flow from a ...
thermal conductivity
Physics. the amount of heat per unit time per unit area that can be conducted through a plate of unit thickness of a given material, the faces of the plate differing by one unit ...
thermal diffusion
Physical Chem. the separation of constituents, often isotopes, of a fluid under the influence of a temperature gradient. Also, thermodiffusion. * * *
thermal efficiency
Thermodynam. the ratio of the work output of a heat engine to the heat input expressed in the same units of energy. [1905-10] * * *
thermal energy
Internal energy of a system in thermodynamic equilibrium (see thermodynamics) by virtue of its temperature. A hot body has more thermal energy than a similar cold body, but a ...
thermal equilibrium
Thermodynam. 1. the relationship between two systems connected only by a diathermic wall. 2. the relationship between two isolated systems the states of which are such that no ...
thermal expansion
Increase in volume of a material as its temperature is increased, usually expressed as a fractional change in dimensions per unit temperature change. When the material is a ...
Thermal expansion of rocks
▪ Table Thermal expansion of rocks rock type linear-expansion coefficient (in 10−6 per degree Celsius) granite and rhyolite    8 ± 3 andesite and diorite    7 ± ...
thermal fusion
▪ chemistry and physics also called  Melting,         change of a solid into a liquid when heat is applied. In a pure crystalline solid, this process occurs at a ...
thermal neutron
▪ physics       any free neutron (one that is not bound within an atomic nucleus) that has an average energy of motion (kinetic energy) corresponding to the average ...
thermal noise
Thermodynam., Elect. a wide spectrum of electromagnetic noise appearing in electronic circuits and devices as a result of the temperature-dependent random motions of electrons ...
thermal pollution
a rise in the temperature of rivers or lakes that is injurious to water-dwelling life and is caused by the disposal of heated industrial waste water or water from the cooling ...
thermal printer
Computers. a printer that produces output by selectively heating a heat-sensitive paper (thermal paper) in patterns corresponding to the characters to be produced. [1980-85] * * *
thermal radiation
Thermodynam. electromagnetic radiation emitted by all matter above a temperature of absolute zero because of the thermal motion of atomic particles. [1930-35] * * * Process by ...
thermal spring
a spring whose temperature is higher than the mean temperature of ground water in the area. [1790-1800] * * *
thermal underwear
underwear designed to retain body heat in cold temperatures. Also called thermals. * * *
thermal unit
a unit of heat energy or of the equivalent of heat energy in work. [1875-80] * * *
/therrm'al jee"zee euh, -see euh/, n. Med. pain caused by heat. [THERM- + ALGESIA] * * *
See thermal. * * *
thermal neutron n. See slow neutron. * * *
thermalneutron analyzer
thermal neutron analyzer n. A device that detects explosives by sensing gamma radiation given off when nitrogen in the explosive is bombarded with and absorbs low-energy ...
thermal noise n. Unwanted currents or voltages in an electronic component resulting from the agitation of electrons by heat. Also called Johnson noise. * * *
thermal pollution n. Industrial discharge of heated water into a river, lake, or other body of water, causing a rise in temperature that endangers aquatic life. * * *
/therrm'an is thee"zheuh/, n. Pathol. loss of ability to feel cold or heat; loss of the sense or feeling of temperature. Also, thermoanesthesia. [1880-85; THERM- + ANESTHESIA] * ...
/therr"mayt/, n. a mixture of thermite and other oxidizing agents used as filling for incendiary munitions. [THERM(ITE) + -ATE2] * * *
/therrm/, n. Physics. therm. * * *
/therr"mel/, n. thermocouple. [THERM- + EL(ECTRIC)] * * *
/therrm'is thee"zheuh, -zhee euh, -zee euh/, n. Pathol. ability to perceive or sense cold or heat; sensitiveness to heat. Also, thermaesthesia. [THERM- + ESTHESIA] * * *
/therr"mik/, adj. thermal (def. 1). [1840-50; THERM- + -IC] * * *
thermic fever
Pathol. sunstroke. [1885-90] * * *
/therr"mi dawr'/; Fr. /terdd mee dawrdd"/, n. 1. Also called Fervidor. (in the French Revolutionary calendar) the 11th month of the year, extending from July 19 to August 17. 2. ...
/therr'mi dawr"ee euhn, -dohr"-/, n. 1. a member of the French moderate group who participated in the downfall of Robespierre and his followers on the 9th Thermidor (July 27th), ...
Thermidorian Reaction
(1794) Revolt in the French Revolution against the Reign of Terror that was initiated on 9 Thermidor (July 27). Weary of the mounting executions (1,300 in June alone), deputies ...
—thermionic, adj. —thermionically, adv. /therrm"uy'euhn, -on; therr"mee euhn/, n. Physics. an ion emitted by incandescent material. [1910-15; THERM- + ION] * * *
See thermion. * * *
thermionic current
an electric current produced by the flow of thermions. [1910-15] * * *
thermionic emission
thermionic emission n. the phenomenon of electron or ion emission from the heated surface of a conductor * * * ▪ physics       discharge of electrons from heated ...
thermionic power converter
▪ electronics Introduction also called  thermionic generator,  thermionic power generator,  or  thermoelectric engine        any of a class of devices that convert ...
thermionic tube
Electronics. a vacuum tube in which the cathode is heated electrically to cause the emission of electrons by thermal agitation. Also called hot-cathode tube. [1925-30] * * *
thermionic valve
Brit. See vacuum tube. [1915-20] * * *
thermionic current n. A flow of thermions. * * *
/therrm'uy on"iks, therr'mee-/, n. (used with a sing. v.) the branch of physics that deals with thermionic phenomena. [1925-30; see THERMIONIC, -ICS] * * *
thermionic tube n. An electron tube in which the source of electrons is a heated electrode. * * *
/theuhr mis"teuhr, therr"meuh steuhr/, n. Electronics. a resistor whose action depends upon changes of its resistance material with changes in temperature. [1935-40; THERM- + ...
/therr"mit/, Trademark. a brand of thermite. * * * ▪ chemical compound also spelled  Thermite,         powdered mixture used in incendiary bombs, in the reduction of ...
/therr"muyt/, n. a mixture of finely-divided metallic aluminum and ferric oxide that when ignited produces extremely high temperatures as the result of the union of the aluminum ...
a combining form meaning "heat," "hot," used in the formation of compound words: thermoplastic. Also, therm-, -therm. [ < Gk, comb. form of thermós hot, thérme heat] * * *
/therr'moh euh sid"euh fuyl', -as"i deuh-/, n. any organism, esp. a type of archaebacterium, that thrives in strongly acidic environments at high temperatures. [THERMO- + ...
ther·mo·a·cou·stic (thûr'mō-ə-ko͞oʹstĭk) adj. Of or relating to a process using rapid, repetitive acoustical shocks to achieve cooling: a thermoacoustic condenser for ...
/therr'moh am"mee'teuhr/, n. Elect. an ammeter that measures amperage by means of a thermocouple. [1890-95; THERMO- + AMMETER] * * *
/therr'moh euh nal"euh sis/, n., pl. thermoanalyses /-seez'/. See thermal analysis. [THERMO- + ANALYSIS] * * *
/therr'moh an'is thee"zheuh/, n. Pathol. thermanesthesia. * * *
/therr'moh beuh rom"i teuhr/, n. 1. Also called hypsometer. an instrument for measuring atmospheric pressure, and sometimes altitude, from its effect upon the boiling point of a ...
ther·mo·cau·ter·y (thûrʹmō-kô'tə-rē) n. pl. ther·mo·cau·ter·ies Cauterization using heat, as with a heated wire. * * *
See thermochemistry. * * *
See thermochemical. * * *
—thermochemical /therr'moh kem"i keuhl/, adj. —thermochemically, adv. —thermochemist, n. /therr'moh kem"euh stree/, n. the branch of chemistry dealing with the relationship ...
—thermoclinal, adj. /therr"meuh kluyn'/, n. a layer of water in an ocean or certain lakes, where the temperature gradient is greater than that of the warmer layer above and the ...
/therr'moh koh ag'yeuh lay"sheuhn/, n. Surg. the coagulation of tissue by heat-producing high-frequency electric currents, used therapeutically to remove small growths or to ...
/therr"meuh kup'euhl/, n. Physics. a device that consists of the junction of two dissimilar metallic conductors, as copper and iron, in which an electromotive force is induced ...
/therr'moh kerr"euhnt, -kur"-/, n. a thermoelectric current. [1840-50; THERMO- + CURRENT] * * *
/therr'moh di fyooh"zheuhn/, n. Physical Chem. See thermal diffusion. [1895-1900; THERMO- + DIFFUSION] * * *
/therr'meuh door"ik, -dyoor"ik/, adj. Bacteriol. (of certain microorganisms) able to survive high temperatures, as during pasteurization. [1930-35; THERMO- + L dur(are) to last + ...
thermodynamics. * * *
—thermodynamically, adv. /therr'moh duy nam"ik/, adj. 1. of or pertaining to thermodynamics. 2. using or producing heat. Also, thermodynamical. [1840-50; THERMO- + DYNAMIC] * * ...
thermodynamic equilibrium
▪ physics       condition or state of a thermodynamic system, the properties of which do not change with time and that can be changed to another condition only at the ...
thermodynamic potential
Thermodynam. See Gibbs function. * * *
thermodynamic system
Physics. a system whose states of equilibrium can be specified by a few macroscopic properties. * * *
See thermodynamic. * * *
—thermodynamicist, n. /therr'moh duy nam"iks/, n. (used with a sing. v.) the science concerned with the relations between heat and mechanical energy or work, and the conversion ...
/therr"moh i las"tik/, adj. Physics. pertaining to the thermodynamic effects produced by deformation of an elastic substance. [1900-05; THERMO- + ELASTIC] * * *
—thermoelectrically, adv. /therr'moh i lek"trik/, adj. of, pertaining to, or involving the direct relationship between heat and electricity. Also, thermoelectrical. [1815-25; ...
thermoelectric couple
Physics. thermocouple. [1860-65] * * *
thermoelectric effect
Physics. the production of an electromotive force in a thermocouple. Also called Seebeck effect. * * *
thermoelectric power generator
Introduction       any of a class of solid-state devices (solid-state device) that either convert heat directly into electricity or transform electrical energy into ...
thermoelectric thermometer
Physics. thermocouple. * * *
See thermoelectric. * * *
/therr'moh i lek tris"i tee, -ee'lek-/, n. electricity generated by heat or temperature difference, as in a thermocouple. [1815-25; THERMO- + ELECTRICITY] * * * ▪ ...
/therr'moh i lek trom"i teuhr, -ee'lek-/, n. Elect. an instrument for measuring a charge or voltage by means of the heat it produces in a resistance. [1835-45; THERMO- + ...
thermoelectromotive [thʉr΄mō ē lek΄trə mōt′iv] adj. designating or of the electromotive force produced by a thermocouple * * *
thermoelectromotive force
/therr"moh i-lek'treuh moh"tiv, therr'-/ the electromotive force developed by the thermoelectric effect. [1885-90; THERMO- + ELECTROMOTIVE] * * *
—thermoelectronic, /therr'moh i lek tron"ik, -ee'lek-/, adj. /therr'moh i lek"tron/, n. Physics. an electron emitted by an incandescent material. [1925-30; THERMO- + ...
thermoelement [thʉr΄mōel′ə mənt] n. a device consisting of a thermocouple and a heating element arranged for measuring small currents, esp. at high frequencies * * *
—thermoformable, adj. /therr"meuh fawrm'/, v.t. to shape (esp. plastic) by the use of heat and pressure. [1955-60; THERMO- + FORM] * * *
/therr'moh gal'veuh nom"i teuhr/, n. Elect. a thermoammeter for measuring small currents, consisting of a thermocouple connected to a direct-current galvanometer. [1865-70; ...
—thermogenetic /therr'moh jeuh net"ik/, adj. /therr'moh jen"euh sis/, n. the production of heat, esp. in an animal body by physiological processes. [1890-95; THERMO- + ...
See thermogenesis. * * *
/therr'meuh jen"ik/, adj. causing or pertaining to the production of heat. [1875-80; THERMO- + -GENIC] * * *
/therr'moh jee og"reuh fee/, n. the study of the geographical variation and distribution of temperature. [1895-1900; THERMO- + GEOGRAPHY] * * *
/therr"meuh gram'/, n. Med. a graphic or visual record produced by thermography. [1880-85; THERMO- + -GRAM1] * * *
/therr"meuh graf', -grahf'/, n. a thermometer that records the temperatures it measures. [1830-40; THERMO- + -GRAPH] * * *
See thermography. * * *
See thermographic. * * *
—thermographer, n. —thermographic /therr'meuh graf"ik/, adj. —thermographically, adv. /theuhr mog"reuh fee/, n. 1. a technique for imitating an embossed appearance, as on ...
thermojunction [thʉr΄mō juŋk′shən] n. the point of contact between the two conductors forming a thermocouple * * * ther·mo·junc·tion (thûr'mō-jŭngkʹshən) n. The ...
▪ geology       land-surface configuration that results from the melting of ground ice in a region underlain by permafrost. In areas that have appreciable amounts of ...
—thermolability /therr'moh leuh bil"i tee/, n. /therr'moh lay"bil, -buyl/, adj. Biochem. subject to destruction or loss of characteristic properties by the action of moderate ...
See thermolabile. * * *
—thermoluminescent, adj. /therr'moh looh'meuh nes"euhns/, n. Physics. phosphorescence produced by the heating of a substance. [1895-1900; THERMO- + LUMINESCENCE] * * ...
thermoluminescence dating
Archaeol. a method of dating archaeological specimens, chiefly pottery, by measuring the radiation given off by ceramic materials as they are heated. [1965-70] * * *
See thermoluminescence. * * *
—thermolytic /therr'meuh lit"ik/, adj. /theuhr mol"euh sis/, n. 1. Physiol. the dispersion of heat from the body. 2. Chem. dissociation by heat. [1870-75; THERMO- + -LYSIS] * * ...
See thermolysis. * * *
/therr'moh mag net"ik/, adj. Physics. 1. of or pertaining to the effect of heat on the magnetic properties of a substance. 2. of or pertaining to the effect of a magnetic field ...
—thermometric /therr'meuh me"trik/, thermometrical, adj. —thermometrically, adv. /theuhr mom"i teuhr/, n. an instrument for measuring temperature, often a sealed glass tube ...
See thermometry. * * *
thermometric titration
Chem. titration in which the end point is determined by measuring the temperature of a solution. * * *
/theuhr mom"i tree/, n. 1. the branch of physics dealing with the measurement of temperature. 2. the science of the construction and use of thermometers. [1855-60; THERMO- + ...
/therr'meuh moh"tiv/, adj. pertaining to motion produced by heat. [THERMO- + MOTIVE] * * *
/therr'meuh moh"teuhr/, n. a heat engine. [THERMO- + MOTOR] * * *
▪ mineral       a carbonate mineral, hydrated sodium carbonate (Na2CO3·H2O), found near saline lakes as an evaporation product or on arid soil as an efflorescence. It ...
/therr'moh nooh"klee euhr, -nyooh"-/ or, by metathesis, /-kyeuh leuhr/, adj. of, pertaining to, or involving a thermonuclear reaction: thermonuclear power. [1935-40; THERMO- + ...
thermonuclear bomb
▪ fusion device also called  hydrogen bomb , or  H-bomb   weapon whose enormous explosive power results from an uncontrolled, self-sustaining chain reaction in which ...
thermonuclear bomb.
See hydrogen bomb. [1945-50] * * *
thermonuclear reaction
Chem., Physics. a nuclear-fusion reaction that takes place between the nuclei of a gas, esp. hydrogen, heated to a temperature of several million degrees. * * * ▪ chemical ...
/therr"meuh payn'/, Trademark. a brand name for a hermetically sealed double glazing. * * *
/therr'moh pear'ee od"ik/, adj. Biol. responding to or affected by periodic differences in temperatures. [THERMO- + PERIODIC1] * * *
/therr'moh pear'ee euh dis"i tee/, n. Biol. the effect on an organism of rhythmic fluctuations in temperature. Also, thermoperiodism /therr'moh pear"ee euh diz'euhm/. [1940-45; ...
ther·mo·pe·ri·od·ism (thûr'mō-pîrʹē-ə-dĭz'əm) also ther·mo·pe·ri·o·dic·i·ty (-dĭsʹĭ-tē) n. The effect on an organism of the rhythmic fluctuation of ...
/therr"meuh fuyl', -fil/, n. a thermophilic organism. [1895-1900; THERMO- + -PHILE] * * *
/therr'meuh fil"ik/, adj. 1. growing best in a warm environment. 2. (of bacteria) growing best at temperatures between 50° and 60°C. [1895-1900; THERMO- + -PHILIC] * * *
/therr"meuh fohn'/, n. an electroacoustic transducer that forms sound waves by the expansion and contraction of the air adjacent to a conductor that varies in temperature ...
—thermophosphorescent, adj. /therr'moh fos'feuh res"euhns/, n. Physics. thermoluminescence. [THERMO- + PHOSPHORESCENCE] * * *
/therr"meuh puyl'/, n. Physics. a device consisting of a number of thermocouples joined in series, used for generating thermoelectric current or for detecting and measuring ...
—thermoplasticity /therr'moh pla stis"i tee/, n. /therr'meuh plas"tik/, adj. 1. soft and pliable when heated, as some plastics, without any change of the inherent ...
See thermoplastic. * * *
▪ Wyoming, United States       resort town, seat (1913) of Hot Springs county, north-central Wyoming, U.S., on the Bighorn River, opposite East Thermopolis. The site ...
/theuhr mop"euh lee'/, n. a pass in E Greece, between the cliffs of Mt. Oeta and the Gulf of Lamia: Persian defeat of the Spartans 480 B.C. * * * ▪ mountain pass, ...
Thermopylae, Battle of
Battle in northern Greece (480 BC) in the Persian Wars. The Greek forces, mostly Spartan, were led by Leonidas. After three days of holding their own against the Persian king ...
Sensory capacity (see sense) to detect the temperature of the environment and the body. It helps keep body temperature stable by regulating autonomic responses to temperature ...
/therr'moh ri sep"teuhr/, n. Physiol. a receptor stimulated by changes in temperature. [1945-50; THERMO- + RECEPTOR] * * *
ther·mo·reg·u·late (thûr'mō-rĕgʹyə-lāt') intr.v. ther·mo·reg·u·lat·ed, ther·mo·reg·u·lat·ing, ther·mo·reg·u·lates 1. To regulate body temperature. 2. To ...
—thermoregulatory /therr'moh reg"yeuh leuh tawr'ee, -tohr'ee/, adj. /therr'moh reg'yeuh lay"sheuhn/, n. Physiol. the regulation of body temperature. [1925-30; THERMO- + ...
See thermoregulation. * * *
/therr"meuhs/, n. a vacuum bottle or similar container lined with an insulating material, such as polystyrene, to keep liquids hot or cold. Also called thermos bottle. [1905-10; ...
thermoscope [thʉr′mə skōp΄] n. 〚 THERMO- + -SCOPE〛 an instrument for indicating changes in temperature of a substance, without accurately measuring them, by observing ...
/therr'moh sen"si tiv/, adj. Chem. readily affected by heat or a change in temperature. [THERMO- + SENSITIVE] * * *
/therr"moh set'ing/, adj. pertaining to a type of plastic, as the urea resins, that sets when heated and cannot be remolded. [1935-40; THERMO- + SETTING] * * *
/therr'meuh suy"feuhn/, n. an arrangement of siphon tubes that enables water in a heating apparatus to circulate by means of convection. [1825-35; THERMO- + SIPHON] * * *
/therr"meuh sfear'/, n. the region of the upper atmosphere in which temperature increases continuously with altitude, encompassing essentially all of the atmosphere above the ...

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