A white metallic element, atomic no. 81, atomic wt. 204.3833; 201Tl (half-life equal to 3.038 days) is used to scan the myocardium. [G. thallos, a green shoot (it gives a green ...
Poisoning with the element thallium which enters the environment primarily from coal-burning and smelting. It stays in the air, water, and soil for a long time and is not broken ...
A method of examining the heart to obtain information about the blood supply to the heart muscle. In the scan, special cameras take a series of pictures of the heart. Radioactive ...
In older classification systems, a primary division of the plant kingdom whose members, with a few exceptions, were devoid of true roots, stems, and leaves; it included bacteria, ...
Poisoning by thallium; marked by stomatitis, gastroenteritis, peripheral and retrobulbar neuritis, endocrine disorders, and alopecia. [ thallium + G. toxikon, poison, + ...
A simple plant or fungus body that is devoid of roots, stems, and leaves. The vegetative growth of a fungus. [G. thallos, a young shoot]
Death. SEE ALSO: necro-. [G. thanatos, death]
Relating to the processes involved in life and death. [ thanato- + G. bios, life, + logos, study]
Of fatal prognosis, indicating the approach of death. [ thanato- + G. gnome, a sign]
1. A description of one's symptoms and thoughts while dying. 2. A treatise on death. [ thanato- + G. graphe, a writing]
1. Resembling death. 2. Deadly. [ thanato- + G. eidos, resemblance]
The branch of science concerned with the study of death and dying. [ thanato- + G. logos, study]
Illness or death resulting from belief in the efficacy of magic; a phenomenon observed among those primitive societies or illiterate and superstitious people who believe in the ...
Venomous snakes. [ thanato- + G. ophidion, dim. of ophis, a serpent]
Morbid fear of death. [ thanato- + G. phobos, fear]
A form of short-limbed (micromelic) dwarfism that usually causes death within the first few hours after birth. Thanatophoric dysplasia is due to a lethal mutation (change) in ...
In psychoanalysis, the death principle, representing all instinctual tendencies toward senescence and death. instinct. Cf.:eros. [G. death]
Sir George D., English anatomist, 1850–1930. See T. method.
The transformation of one form of tissue into another. [G. thauma (thaumat-), a wonder, + trope, a turning]
James D. See T.- Martin medium, T.- Martin agar.
Abbreviation for tetrahydrocannabinol.
Symbol for ribothymidine.
A weekly medical journal headquartered in London. Published uninterruptedly and with the same title since 1823, The Lancet is "the longest running medical journal in the world." ...
1. A large room for lectures and demonstrations; sometimes applied to an operating room equipped for observation by persons other than the surgical team. 2. Any operating room ...
Relating to or derived from opium. [L. Thebaicus, relating to Thebes, whence opium was formerly obtained]
An alkaloid obtained from opium (0.3–1.5%); it resembles strychnine in its action, causing tetanic convulsions. SYN: paramorphine.
Adam C., German physician, 1686–1732. See thebesian foramina, under foramen, thebesian valve, thebesian veins, under vein.
A sheath or capsule. [G. theke, a box]
- t. cordis SYN: pericardium.
- t. externa SYN: tunica externa thecae folliculi.
- t. folliculi the wall of a vesicular ovarian ...
Relating to a sheath, especially a tendon sheath. [see theca]
Having the teeth inserted in alveoli. [G. theke, box, + odous (odont-), tooth]
A neoplasm derived from ovarian mesenchyme, consisting chiefly of spindle-shaped cells that frequently contain small droplets of fat; gross features generally resemble those of a ...
A stromal hyperplasia or increase in the number of connective tissue elements of an ovary.
Johann C.A., German surgeon, 1714–1797. See T. method.
Friedrich W., German anatomist, 1801–1879. See T. canal, T. glands, under gland, T. muscle.
Max, South African microbiologist in the U.S. and Nobel laureate, 1899–1972. See T. virus.
A family of sporozoan protozoa which, combined with the family Babesiidae, comprises the order Piroplasmida; it consists of one recognized genus, Theileria, transmitted by ...
Chronic poisoning resulting from immoderate tea-drinking, marked by palpitation, insomnia, nervousness, headache, and dyspepsia. SYN: theaism. [Mod. L. thea, tea]
The beginnings of breast development at puberty. Thelarche is now a normal event at an earlier age (e.g., age 8) than in the past. The term thelarche comes from two Greek words: " ...
The eye worms, a genus of spiruroid nematodes that inhabit the lacrimal ducts and surface of the eyes of various domestic and wild animals, but rarely humans; a number of species ...
Infection with nematodes of the genus Thelazia.
1. A nipplelike structure. 2. A cellular layer. 3. SYN: nipple. [Mod. L., fr. G. thele, nipple]
Bleeding from the nipple. [thelo- + G. rhegnymi, to burst forth]
Toward the thenar or lateral side of the palm of the hand. [G. thenar, the palm of the hand, + L. ad, to]
An antihistaminic and antipruritic agent (as the tartrate).
Term applied to any structure in relation with the base of the thumb or its underlying collective components. SYN: thenal. See t. eminence. [G. the palm of the hand]
Relating only to the palm, specifically to the radial side. [G. thenar, palm, + en, in]
The radical of 2-methylthiophene, (SC4H3)CH2–. Cf.:thienyl.
SYN: cacao. [G. theos, a god, + broma, food]
- t. oil the fat obtained from the wasted seed of T. cacao (family Sterculiaceae); it contains the glycerides of stearic, palmitic, ...
An alkaloid resembling caffeine and theophylline in its action and chemical structure, prepared from the dried ripe seed of Theobroma cacao or made synthetically; formerly used ...
A delusion in which one believes that he or she is God. [G. theos, god, + mania, frenzy]
Morbid fear of God. [G. theos, god, + phobos, fear]
An alkaloid found with caffeine in tea leaves (commercial t. is prepared synthetically); a smooth muscle relaxant, diuretic, cardiac stimulant, and vasodilator; used in ...
A proposition that can be tested, and can be established as a law or principle. SEE ALSO: law, principle, rule.
- Bayes t. the impacts of new data on the evidential merits of ...
A probability principle set forth by the English mathematician Thomas Bayes (1702-1761). Bayes' theorem is of value in medical decision-making and some of the biomedical ...
A reasoned explanation of known facts or phenomena that serves as a basis of investigation by which to seek the truth. SEE ALSO: hypothesis, postulate. [G. theoria, a beholding, ...
Treatment of disease by prayer or religious exercises. [G. theos, god, + therapeia, therapy]
A nest or aggregation of nevocytes in the epidermis. [Fr. a small box]
Relating to therapeutics, that part of medicine concerned specifically with the treatment of disease. The therapeutic dose of a drug is the amount needed to treat a disease. ...
A procedure in which cells, typically skin cells, are taken from a patient and inserted into a fertilized egg whose nucleus has been removed. The cell that is so created is ...
In medicine, the branch that deals specifically with the treatment of disease and the art and science of healing. In pharmacology, therapeutics accordingly refers to the use of ...
An older term to denote one skilled in therapeutics.
1. SYN: therapy. 2. SYN: therapeutics. [L. fr. G. therapeia, therapy]
- t. magna sterilisans Ehrlich concept that an infectious disease, especially one of protozoal origin, ...
One professionally trained and/or skilled in the practice of a particular type of therapy.
1. The treatment of disease or disorder by any method. SEE ALSO: therapeutics. 2. In psychiatry, and clinical psychology, a short term for psychotherapy. SEE ALSO: ...
Treatment that is given in addition to the primary (initial) treatment. Adjuvant treatment is an addition to the primary treatment and is designed to help reach the ultimate ...
Therapy, antiretroviral (ART)
Treatment that suppresses or stops a retrovirus. One of the retrovirus is the human immunodeficiency virus (HIV) that causes AIDS. Retroviruses are so named because they carry ...
Treatment to stimulate or restore the ability of the immune (defense) system to fight infection and disease. Biological therapy is thus any form of treatment that uses the body's ...
Therapy, constraint-induced movement
A form of intensive physical therapy aimed at reorganizing and reprogramming the brain after a stroke, a traumatic brain injury, or spinal cord damage.
Using abnormal elevations in body temperature as a tool to treat disease. This was done in the past by deliberately raising the patient's temperature to cause fever. Fever ...
Insertion of normal DNA directly into cells to correct a genetic defect. The treatment of disease by replacing, altering, or supplementing a gene that is absent or abnormal and ...
Therapy, human gene
Insertion of normal DNA directly into cells to correct a genetic defect. The treatment of disease by replacing, altering, or supplementing a gene that is absent or abnormal and ...
Therapy, testosterone replacement
The practice of giving testosterone to treat conditions in which the testes do not produce enough testosterone. This may be due to absence, injury, or disease. Testosterone is ...
Denoting a skull in which the angle at the hormion, formed by lines converging from the inion and nasion, measures from 116°–129°. [G. ther, wild beast, + enkephalos, ...
A mixture containing a great number of ingredients, used in the Middle Ages and believed to possess antidotal and curative powers to an almost miraculous degree. [L. antidote ...
Animals. [G. ther, therion, beast]
Ascription of animal characteristics to human beings. Cf.:anthropomorphism. [ therio- + morphe, form]
A unit of heat used indiscriminately for: 1) a small calorie, 2) a large calorie, 3) 1000 large calories, 4) 100,000 British thermal units. [G. therme, heat]
The elevation of body temperature by drug action. [G. therme, heat, + pharmakon, drug, + genesis, production]
High sensibility to heat; pain caused by a slight degree of heat. SYN: thermoalgesia. [ therm- + G. algesis, sense of pain]
Burning pain. SEE ALSO: causalgia. [ therm- + G. algos, pain]
The branch of therapeutics concerned with the application of heat. SEE ALSO: thermotherapy. [ therm- + G. logos, study]
An electric thermometer, especially used for recording slight variations of temperature. [ therm- + electric + G. metron, measure]
A device for determining temperature; also may be used to monitor control of temperature. [G. therme, heat]
Loss of the temperature sense or of the ability to distinguish between heat and cold; insensibility to heat or to temperature changes. SYN: thermanalgesia, thermanesthesia, ...
Removal of tissue by thermocautery. [ thermocautery + G. ektome, excision]
The use of an actual cautery, such as an electrocautery. [thermo- + G. kauterion, branding iron (cautery)]
1. Relating to thermochrose. 2. Exerting a selective action on heat rays.
The property possessed by heat rays of reflection, refraction, and absorption, similar to that of light rays. SYN: thermochrosy. [thermo- + G. chrosis, coloring]
The selective action of certain substances on radiant heat, absorbing some of the rays, reflecting or transmitting others. SYN: thermochroism. [thermo- + G. chrosis, coloring]
The process of converting tissue into a gel by heat. SYN: endocoagulation.
A device for measuring slight changes in temperature, consisting of two wires of different metals, one wire being kept at a certain low temperature, the other in the tissue or ...
Diffusion of fluids, either gaseous or liquid, as influenced by the temperature of the fluid.
Reduction in temperature in a liquid that occurs when it is introduced into a colder liquid; the volume of the latter liquid can be calculated from the amount of rise in its ...
Resistant to the effects of exposure to high temperature; used especially with reference to microorganisms. [thermo- + L. durus, hard, enduring]
1. The branch of physicochemical science concerned with heat and energy and their conversions one into the other involving mechanical work. 2. The study of the flow of heat. ...
The ability to distinguish differences of temperature. SYN: temperature sense, thermal sense, thermic sense, thermesthesia. [thermo- + G. aisthesis, sensation]
An instrument for testing the temperature sense, consisting of a metal disk with thermometer attached, by which the exact temperature of the disk at the time of application may ...
The production of heat; specifically the physiologic process of heat production in the body. [thermo- + G. genesis, production]
- nonshivering t. t. resulting from the effects of ...
A protein found in brown adipose tissue that acts as a thermogenic uncoupling protein of oxidative phosphorylation; it allows thermogenesis in this type of tissue.
1. A regional temperature map of the surface of a part of the body, obtained by an infrared sensing device; it measures radiant heat, and thus subcutaneous blood flow, if the ...
An instrument or device used in producing a thermogram. [thermo- + G. grapho, to write]
The technique for making a thermogram.
- infrared t. measurement of the regional skin temperature with an infrared sensing device.
- liquid crystal t. measurement of the ...
Excessive thermalgesia. [thermo- + G. hyper, over, algesis, sense of pain]
Very acute thermoesthesia or temperature sense; exaggerated perception of hot and cold. [thermo- + G. hyper, over, + aisthesis, sensation]
Diminished perception of temperature differences. SYN: thermohypoesthesia. [thermo- + G. hypo, under, + aisthesis, sensation]
Any device for assessing the effective warmth or coldness of an environment as it might be experienced by a living organism, taking into account radiation and convection as well ...
A procedure in which the application of heat shrinks the collagen of the corneal stroma and flattens the cornea in the area of heat application. This tends to make the eye less ...
Subject to alteration or destruction by heat. [thermo- + L. labilis, perishable]
The science of heat. SYN: thermotics. [thermo- + G. logos, study]
1. Loss of body heat by evaporation, radiation, etc. 2. Chemical decomposition by heat. [thermo- + G. lysis, dissolution]
1. Relating to thermolysis. 2. An agent promoting heat dissipation.
Combination of heat and massage in physical therapy.
A device used to measure the temperature of gaseous, liquid or solid matter or of a chemical reaction such as fire. Temperature measurement is important to a wide range of ...
A thermometer that registers body temperature via the ear canal. The ear thermometer was invented in 1964 by Dr. Theodor H. Benzinger. Dr. Benzinger worked from 1947 to 1970 at ...
Relating to thermometry or to a thermometer reading.
The measurement of temperature. [thermo- + G. metron, measure]
Elevation of the temperature of the body due to an emotional influence.
Pertaining to nuclear reactions brought about by nuclear fusion ( e.g., the fusion of hydrogen to helium at temperatures of over 100,000,000°C; the reaction in the “hydrogen ...
An organism that thrives at a temperature of 50°C or higher. [thermo- + G. phileo, to love]
An abnormal and persistent fear of heat, including hot weather and hot objects. Sufferers from thermophobia experience anxiety even though they realize their fear is irrational. ...
1. An arrangement for applying heat to a part; consists of a water heater, a tube conveying hot water to a coil, and another tube conducting the water back to the heater. 2. A ...
Resistant to heat, denoting certain microorganisms. [thermo- + G. phylaxis, protection]
A thermoelectric battery, consisting usually of a series of bars of antimony and bismuth joined together, that generates a thermoelectric current when the junctions are ...
Obsolete method for determination of placental position by detection of infrared rays from the large amounts of blood flowing through the placenta. [thermo- + L. placenta, ...
A genus of bacteria (order Mycoplasmatales) which possess the same characteristics as the organisms in the genus Mycoplasma except that the thermoplasmas do not require sterol ...
A vernacular term used to refer to any member of the genus T..
A classification for materials that can be made soft by the application of heat and harden upon cooling.
A rarely used term for sunstroke. [thermo- + G. plege, stroke]
An instrument for indicating slight differences of temperature, without registering or recording them. SYN: differential thermometer. [thermo- + G. skopeo, to view]
A classification for materials that become hardened or cured by the application of heat.
Not readily subject to alteration or destruction by heat. SYN: heat-stable. [thermo- + L. stabilis, stable]
A device that monitors temperature and automatically maintains it at certain levels. In a human, a tiny part of the brain called the hypothalamus, located behind the eyes, serves ...
The abstraction or deprivation of heat. [thermo- + G. steresis, deprivation, loss]
A stromuhr that consists of a heating element between two thermocouples, which are applied to the outside of a vessel; blood flow is calculated from the difference in ...
Relating to thermosystaltism. [thermo- + G. systaltikos, contractile]
Contraction, as of the muscles, under the influence of heat. [see thermosystaltic]
1. Reaction of living protoplasm to the stimulus of heat. Cf.:thermotropism. 2. Regulation of the temperature of the body. [thermo- + G. taxis, orderly arrangement]
- negative ...
Treatment of disease by therapeutic application of heat. [thermo- + G. therapeia, treatment]
An instrument for measuring the degree of thermosystaltism, or muscular contraction under the influence of heat. [thermo- + G. tonos, tone, tension, + metron, measure]
The motion by a part of an organism ( e.g., leaves or stems) toward or away from a source of heat. Cf.:thermotaxis. [thermo- + G. trope, a turning]
Resembling an animal in instincts or propensities. [G. ther, a wild beast, + eidos, resemblance]
The study of mammals. [G. ther, a wild beast, + logos, study]
Rarely used term for a metabolic disorder in which a substance accumulates or is stored in certain cells, usually in large amounts. [G. thesauros, store, storehouse, + G. -osis, ...
Abnormal or excessive storage in the body of normal or foreign substances. [G. thesauros, store, storehouse]
1. Any theory or hypothesis advanced as a basis for discussion. 2. A proposition submitted by the candidate for a doctoral degree in some universities, which must be sustained ...
1. The 8th letter in the Greek alphabet, θ. 2. The eighth in a series; denotes the position of a substituent located on the eighth atom from the carboxyl or other functional ...
Methyl sulfonium compounds, abundant in marine algae, in which the S-methyl group is “active,” and that therefore act as methyl donors in some plants; e.g., ...
Abbreviation for tetrahydrofolate. See 5,6,7,8-tetrahydrofolate dehydrogenase, tetrahydrofolate methyltransferase.
The replacement of carbon by sulfur in a ring or chain. Cf.:thio-. [G. theion]
A broad spectrum anthelmintic especially useful against Strongyloides stercoralis and, with corticosteroids, against Trichinella infection ( trichina worm).
An ultra-short-acting thiobarbiturate for induction of general anesthesia by intravenous injection; used as the sodium salt.
A heat-labile and water-soluble vitamin contained in milk, yeast, and in the germ and husk of grains; also artificially synthesized; essential for growth; a deficiency of t. is ...
1. An enzyme present in raw fish that destroys thiamin and may produce thiamin deficiency in animals on a diet largely composed of raw fish. 2. A hydrolase cleaving thiamin ...
Thiamine is vitamin B1. Thiamine acts as a coenzyme in the metabolism of the body. Deficiency of thiamine leads to beriberi, a disease affecting the heart and nervous system. ...
An antibiotic with uses and toxicity similar to those of chloramphenicol. SYN: thiophenicol.
A short-acting barbiturate, prepared as a mixture with sodium bicarbonate, used intravenously to produce anesthesia.
A widespread genus of operculate snails (family Thiaridae, subclass Prosobranchiata) found in fresh and brackish waters, chiefly in tropical and subtropical Africa and Asia. T. ...
Abbreviated form of benzothiadiazides.
Parent substance of a family of biologic blue dyes; e.g., methylene blue, thionin, toluidine blue.
It has the same uses as glucosulfone sodium, but is less toxic and also less effective in the treatment of leprosy.
1. The measure of the depth of something, as opposed to its length or width. 2. A layer or stratum.
- Breslow t. maximal t. of a primary cutaneous melanoma measured in ...
The presence of sulfur in the circulating blood. [G. theion, sulfur, + haima, blood]
The first member of a family of des-thia-carbapenem nucleus antibiotics having a thioethylamine side chain on the enamine portion of the fused 5-membered ring.
The radical of thiophene, SC4H3–. Cf.:thenyl.
A compound structurally similar to phenylalanine that inhibits the growth of Escherichia coli, presumably by competitive inhibition of enzymes for which l-phenylalanine is the ...
Carl Jörg, German physician. See Weyers-T. syndrome.
Joseph, French physician, *1885. See Achard-T. syndrome.
Karl, German surgeon, 1822–1895. See T. graft, T. canaliculi, under canaliculus, Ollier-T. graft.
An antiemetic agent used to control nausea and vomiting associated with vertigo, the administration of general anesthetics, and with several other clinical conditions; also has ...
The thigh extends from the hip to the knee. The thigh has only one bone, the femur which is the largest bone in the human body. The thigh is the thick part of the leg. This is ...
The thigh bone in anatomy is called the "femur." Whichever term you care to use — thigh bone or femur, it is the bone in the leg that extends from the hip to the knee. The thigh ...
Sensibility to touch. [G. thigma, touch, + aisthesis, sensation]
A form of barotaxis; denoting the reaction of plant or animal protoplasm to contact with a solid body. Cf.:thigmotropism. [G. thigma, touch, + taxis, orderly arrangement]
A movement toward or away from a touch stimulus on the part of a portion of an organism, such as leaves or tendrils. Cf.:thigmotaxis. [G. thigma, touch, + trope, a turning]
An antiseptic. SYN: thiomersal, thiomersalate.
The act of reasoning.
- abstract t. t. in terms of concepts and general principles ( e.g., perceiving a table and a chair as furniture), as contrasted with concrete t..
Causing a decrease in viscosity by dilution, including by chemical means, as by the addition of a solvent, or by mechanical means, as in shear t..
- shear t. decreasing the ...
ThinPrep Pap test
A modified Pap test technique designed to reduce some of the technical problems inherent in the traditional type of Pap smear. In the traditional Pap test, cell samples are ...
Prefix denoting the replacement of oxygen by sulfur in a compound. Cf.:thia-. [G. theion, sugar]
An organic acid in which one or more of the oxygen atoms have been replaced by sulfur atoms; e.g., thiosulfuric acid. SYN: sulfacid, sulfoacid (1).
A salt or ester of a -thioic acid.
Hypnotics of the barbiturate group, e.g., thiopental, in which the oxygen atom at carbon-2 is replaced by sulfur.
A synthetic compound whose molecule contains the three antituberculous groups p-aminosalicylic acid, p-aminobenzaldehyde thiosemicarbazone, and the thiocarbamide group; an ...
A fluorescent compound, produced by the oxidation of thiamin; used in methods for detection and determination of thiamin.
A salt of thiocyanic acid. SYN: rhodanate, sulfocyanate.
HS–CN; hydrogen thiocyanate. SYN: rhodanic acid, sulfocyanic acid.
Peptides that also contain one or more acylated thiol groups ( E.G., of cysteine). [ thio- + G. depseo, to knead, blend, + peptide]
An acylated thiol; RCOSR′; E.G., acetyl-CoA. SYN: acylmercaptan.
An enzyme that hydrolyzes thioesters; E.G., the deacylating activity at the end of fatty acid biosynthesis that releases palmitate. SYN: thiolesterase.
In enzymology, an ester where the oxygen bridging the substrate or product carbonyl carbon and the enzyme is replaced by a sulfur (usually through a Cys residue); a high-energy ...
An enzyme transferring acetyl from acetyl-CoA to the sulfur atom of thioethanolamine, thus producing coenzyme A and S-acetylthioethanolamine. SYN: thiotransacetylase B.
An organic sulfide; an ether in which the oxygen is replaced by sulfur; R—S—R′.
A yellow thiazole dye, used in histopathology as a fluorochrome for hyaline and amyloid.
A methylated and sulfonated derivative of primulin; a yellowish dye used in fluorescence microscopy as a vital stain.
An enzyme in mustard seed that converts thioglycosides into thiols plus sugars. SYN: myrosinase, sinigrase, sinigrinase.
A salt or ester of thioglycolic acid; frequently used in bacterial media to reduce their oxygen content so as to create favorable conditions for the growth of anaerobes; the t. ...
Used as a reagent for the detection of metals such as iron, molybdenum, silver, and tin; the ammonium and sodium salts are used in home permanents, the calcium salt as a ...
An antineoplastic agent used for leukemias and nephrosis.
Group term for enzymes that form acyl-CoA compounds from the corresponding fatty acid s and CoA; the bond is through the sulfur atom of the CoA.
1. The monovalent radical –SH when attached to carbon; a hydrosulfide; a mercaptan. 2. A mixture of sulfurated and sulfonated petroleum oils purified with ammonia; used in ...
SYN: acetyl-CoA acetyltransferase.
The cleavage of a chemical bond with the addition of coenzyme A to one part; analogous to hydrolysis and phosphorolysis.