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thallium
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 ...
Thallium poisoning
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 ...
Thallium scan
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 ...
Thallophyta
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, ...
thallophyte
A member of the division Thallophyta.
thallotoxicosis
Poisoning by thallium; marked by stomatitis, gastroenteritis, peripheral and retrobulbar neuritis, endocrine disorders, and alopecia. [ thallium + G. toxikon, poison, + ...
thallus
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]
thanato-
Death. SEE ALSO: necro-. [G. thanatos, death]
thanatobiologic
Relating to the processes involved in life and death. [ thanato- + G. bios, life, + logos, study]
thanatognomonic
Of fatal prognosis, indicating the approach of death. [ thanato- + G. gnome, a sign]
thanatography
1. A description of one's symptoms and thoughts while dying. 2. A treatise on death. [ thanato- + G. graphe, a writing]
thanatoid
1. Resembling death. 2. Deadly. [ thanato- + G. eidos, resemblance]
thanatology
The branch of science concerned with the study of death and dying. [ thanato- + G. logos, study]
thanatomania
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 ...
thanatophidia
Venomous snakes. [ thanato- + G. ophidion, dim. of ophis, a serpent]
thanatophobia
Morbid fear of death. [ thanato- + G. phobos, fear]
thanatophoric
Leading to death. [ thanato- + G. phoros, bearing]
Thanatophoric dysplasia
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 ...
thanatos
In psychoanalysis, the death principle, representing all instinctual tendencies toward senescence and death. instinct. Cf.:eros. [G. death]
Thane
Sir George D., English anatomist, 1850–1930. See T. method.
thaumatropy
The transformation of one form of tissue into another. [G. thauma (thaumat-), a wonder, + trope, a turning]
Thayer
James D. See T.- Martin medium, T.- Martin agar.
THC
Abbreviation for tetrahydrocannabinol.
Thd
Symbol for ribothymidine.
The Lancet
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." ...
thea
SYN: tea. [Mod. L.]
theaism
SYN: theinism.
theater
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 ...
thebaic
Relating to or derived from opium. [L. Thebaicus, relating to Thebes, whence opium was formerly obtained]
thebaine
An alkaloid obtained from opium (0.3–1.5%); it resembles strychnine in its action, causing tetanic convulsions. SYN: paramorphine.
Thebesius
Adam C., German physician, 1686–1732. See thebesian foramina, under foramen, thebesian valve, thebesian veins, under vein.
theca
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 ...
thecal
Relating to a sheath, especially a tendon sheath. [see theca]
thecodont
Having the teeth inserted in alveoli. [G. theke, box, + odous (odont-), tooth]
thecoma
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 ...
thecomatosis
A stromal hyperplasia or increase in the number of connective tissue elements of an ovary.
Theden
Johann C.A., German surgeon, 1714–1797. See T. method.
Theile
Friedrich W., German anatomist, 1801–1879. See T. canal, T. glands, under gland, T. muscle.
Theiler
Max, South African microbiologist in the U.S. and Nobel laureate, 1899–1972. See T. virus.
Theileriidae
A family of sporozoan protozoa which, combined with the family Babesiidae, comprises the order Piroplasmida; it consists of one recognized genus, Theileria, transmitted by ...
thein
SYN: caffeine.
theinism, theism
Chronic poisoning resulting from immoderate tea-drinking, marked by palpitation, insomnia, nervousness, headache, and dyspepsia. SYN: theaism. [Mod. L. thea, tea]
thel-
See thelo-.
Thelarche
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: " ...
Thelazia
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 ...
thelaziasis
Infection with nematodes of the genus Thelazia.
thele
SYN: nipple. [G.]
thelium
1. A nipplelike structure. 2. A cellular layer. 3. SYN: nipple. [Mod. L., fr. G. thele, nipple]
thelo-, thel-
The nipples. Cf.:mamil-. [G. thele]
thelorrhagia
Bleeding from the nipple. [thelo- + G. rhegnymi, to burst forth]
thenad
Toward the thenar or lateral side of the palm of the hand. [G. thenar, the palm of the hand, + L. ad, to]
thenal
SYN: thenar.
thenaldine
An antihistaminic and antipruritic agent (as the tartrate).
thenar
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]
thenen
Relating only to the palm, specifically to the radial side. [G. thenar, palm, + en, in]
thenyl
The radical of 2-methylthiophene, (SC4H3)CH2–. Cf.:thienyl.
thenyldiamine hydrochloride
An antihistaminic.
Theobald Smith
See Smith.
theobroma
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, ...
theobromine
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 ...
theomania
A delusion in which one believes that he or she is God. [G. theos, god, + mania, frenzy]
theophobia
Morbid fear of God. [G. theos, god, + phobos, fear]
theophylline
An alkaloid found with caffeine in tea leaves (commercial t. is prepared synthetically); a smooth muscle relaxant, diuretic, cardiac stimulant, and vasodilator; used in ...
theorem
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 ...
Theorem, Bayes
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 ...
theory
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, ...
theotherapy
Treatment of disease by prayer or religious exercises. [G. theos, god, + therapeia, therapy]
thèque
A nest or aggregation of nevocytes in the epidermis. [Fr. a small box]
therapeusis
1. SYN: therapeutics. 2. SYN: therapy.
Therapeutic
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. ...
Therapeutic cloning
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 ...
Therapeutics
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 ...
therapeutist
An older term to denote one skilled in therapeutics.
therapia
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, ...
therapist
One professionally trained and/or skilled in the practice of a particular type of therapy.
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: ...
Therapy, adjuvant
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 ...
Therapy, biological
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.
Therapy, fever
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 ...
Therapy, 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, 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 ...
therencephalous
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, ...
theriaca
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 ...
therio-
Animals. [G. ther, therion, beast]
theriomorphism
Ascription of animal characteristics to human beings. Cf.:anthropomorphism. [ therio- + morphe, form]
therm
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]
therm-
See thermo-.
thermacogenesis
The elevation of body temperature by drug action. [G. therme, heat, + pharmakon, drug, + genesis, production]
thermal
Pertaining to heat.
thermalgesia
High sensibility to heat; pain caused by a slight degree of heat. SYN: thermoalgesia. [ therm- + G. algesis, sense of pain]
thermalgia
Burning pain. SEE ALSO: causalgia. [ therm- + G. algos, pain]
thermanalgesia
SYN: thermoanesthesia. [ therm- + analgesia]
thermanesthesia
SYN: thermoanesthesia.
thermatology
The branch of therapeutics concerned with the application of heat. SEE ALSO: thermotherapy. [ therm- + G. logos, study]
thermelometer
An electric thermometer, especially used for recording slight variations of temperature. [ therm- + electric + G. metron, measure]
thermesthesia
SYN: thermoesthesia.
thermesthesiometer
SYN: thermoesthesiometer.
thermistor
A device for determining temperature; also may be used to monitor control of temperature. [G. therme, heat]
thermo-, therm-
Heat. [G. therme, heat; thermos, warm or hot]
thermoacidophiles
Archaebacteria that grow in hot sulfur springs at low pH.
thermoalgesia
SYN: thermalgesia.
thermoanalgesia
SYN: thermoanesthesia.
thermoanesthesia
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, ...
thermocauterectomy
Removal of tissue by thermocautery. [ thermocautery + G. ektome, excision]
thermocautery
The use of an actual cautery, such as an electrocautery. [thermo- + G. kauterion, branding iron (cautery)]
thermochemistry
The interrelation of chemical action and heat.
thermochroic
1. Relating to thermochrose. 2. Exerting a selective action on heat rays.
thermochroism
SYN: thermochrosis.
thermochrose
The property possessed by heat rays of reflection, refraction, and absorption, similar to that of light rays. SYN: thermochrosy. [thermo- + G. chrosis, coloring]
thermochrosis
The selective action of certain substances on radiant heat, absorbing some of the rays, reflecting or transmitting others. SYN: thermochroism. [thermo- + G. chrosis, coloring]
thermochrosy
SYN: thermochrose.
thermocoagulation
The process of converting tissue into a gel by heat. SYN: endocoagulation.
thermocouple
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 ...
thermocurrent
A current of thermoelectricity.
thermodiffusion
Diffusion of fluids, either gaseous or liquid, as influenced by the temperature of the fluid.
thermodilution
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 ...
thermoduric
Resistant to the effects of exposure to high temperature; used especially with reference to microorganisms. [thermo- + L. durus, hard, enduring]
thermodynamics
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. ...
thermoelectric
Relating to thermoelectricity.
thermoelectricity
An electrical current generated in a thermopile.
thermoesthesia
The ability to distinguish differences of temperature. SYN: temperature sense, thermal sense, thermic sense, thermesthesia. [thermo- + G. aisthesis, sensation]
thermoesthesiometer
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 ...
thermoexcitory
Stimulating the production of heat.
thermogenesis
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 ...
thermogenetic, thermogenic
1. Relating to thermogenesis. SYN: thermogenous. 2. SYN: calorigenic (2).
thermogenics
The science of heat production.
thermogenin
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.
thermogenous
SYN: thermogenetic (1).
thermogram
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 ...
thermograph
An instrument or device used in producing a thermogram. [thermo- + G. grapho, to write]
thermography
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 ...
thermohyperalgesia
Excessive thermalgesia. [thermo- + G. hyper, over, algesis, sense of pain]
thermohyperesthesia
Very acute thermoesthesia or temperature sense; exaggerated perception of hot and cold. [thermo- + G. hyper, over, + aisthesis, sensation]
thermohypesthesia
Diminished perception of temperature differences. SYN: thermohypoesthesia. [thermo- + G. hypo, under, + aisthesis, sensation]
thermohypoesthesia
SYN: thermohypesthesia.
thermoinhibitory
Inhibiting or arresting thermogenesis.
thermointegrator
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 ...
thermojunction
SYN: thermocouple.
thermokeratoplasty
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 ...
thermolabile
Subject to alteration or destruction by heat. [thermo- + L. labilis, perishable]
thermology
The science of heat. SYN: thermotics. [thermo- + G. logos, study]
thermolysis
1. Loss of body heat by evaporation, radiation, etc. 2. Chemical decomposition by heat. [thermo- + G. lysis, dissolution]
thermolytic
1. Relating to thermolysis. 2. An agent promoting heat dissipation.
thermomassage
Combination of heat and massage in physical therapy.
Thermometer
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 ...
Thermometer, ear
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 ...
thermometric
Relating to thermometry or to a thermometer reading.
thermometry
The measurement of temperature. [thermo- + G. metron, measure]
thermoneurosis
Elevation of the temperature of the body due to an emotional influence.
thermonuclear
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 ...
thermopenetration
SYN: medical diathermy.
thermophile, thermophil
An organism that thrives at a temperature of 50°C or higher. [thermo- + G. phileo, to love]
thermophilic
Pertaining to a thermophile.
Thermophobia
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. ...
thermophore
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 ...
thermophylic
Resistant to heat, denoting certain microorganisms. [thermo- + G. phylaxis, protection]
thermopile
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 ...
thermoplacentography
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, ...
Thermoplasma
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 ...
thermoplasma
A vernacular term used to refer to any member of the genus T..
thermoplastic
A classification for materials that can be made soft by the application of heat and harden upon cooling.
thermoplegia
A rarely used term for sunstroke. [thermo- + G. plege, stroke]
thermoreceptor
A receptor that is sensitive to heat.
thermoregulation
Temperature control, as by a thermostat.
thermoregulator
SYN: thermostat.
thermoscope
An instrument for indicating slight differences of temperature, without registering or recording them. SYN: differential thermometer. [thermo- + G. skopeo, to view]
thermoset
A classification for materials that become hardened or cured by the application of heat.
thermostabile, thermostable
Not readily subject to alteration or destruction by heat. SYN: heat-stable. [thermo- + L. stabilis, stable]
Thermostat
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 ...
thermosteresis
The abstraction or deprivation of heat. [thermo- + G. steresis, deprivation, loss]
thermostromuhr
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 ...
thermosystaltic
Relating to thermosystaltism. [thermo- + G. systaltikos, contractile]
thermosystaltism
Contraction, as of the muscles, under the influence of heat. [see thermosystaltic]
thermotactic, thermotaxic
Relating to thermotaxis.
thermotaxis
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 ...
thermotherapy
Treatment of disease by therapeutic application of heat. [thermo- + G. therapeia, treatment]
thermotic
Relating to thermotics.
thermotics
SYN: thermology. [G. thermotes, heat]
thermotonometer
An instrument for measuring the degree of thermosystaltism, or muscular contraction under the influence of heat. [thermo- + G. tonos, tone, tension, + metron, measure]
thermotropism
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]
theroid
Resembling an animal in instincts or propensities. [G. ther, a wild beast, + eidos, resemblance]
therology
The study of mammals. [G. ther, a wild beast, + logos, study]
thesaurismosis
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, ...
thesaurismotic
Pertaining to thesaurismosis.
thesaurosis
Abnormal or excessive storage in the body of normal or foreign substances. [G. thesauros, store, storehouse]
thesis
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 ...
theta
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 ...
thetins
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., ...
THF
Abbreviation for tetrahydrofolate. See 5,6,7,8-tetrahydrofolate dehydrogenase, tetrahydrofolate methyltransferase.
thia-
The replacement of carbon by sulfur in a ring or chain. Cf.:thio-. [G. theion]
thiabendazole
A broad spectrum anthelmintic especially useful against Strongyloides stercoralis and, with corticosteroids, against Trichinella infection ( trichina worm).
thiabutazide
SYN: buthiazide.
thiacetazone
SYN: amithiozone.
thialbarbital
An ultra-short-acting thiobarbiturate for induction of general anesthesia by intravenous injection; used as the sodium salt.
thiambutosine
An antileprotic agent.
thiamin
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 ...
thiaminase
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
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. ...
thiamphenicol
An antibiotic with uses and toxicity similar to those of chloramphenicol. SYN: thiophenicol.
thiamylal sodium
A short-acting barbiturate, prepared as a mixture with sodium bicarbonate, used intravenously to produce anesthesia.
Thiara
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. ...
thiazides
Abbreviated form of benzothiadiazides.
thiazin
Parent substance of a family of biologic blue dyes; e.g., methylene blue, thionin, toluidine blue.
thiazolidinediones
SYN: glitazones.
thiazolsulfone
It has the same uses as glucosulfone sodium, but is less toxic and also less effective in the treatment of leprosy.
thickness
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 ...
thiel
SYN: sulfhydryl.
thiemia
The presence of sulfur in the circulating blood. [G. theion, sulfur, + haima, blood]
thienamycin
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.
thienyl
The radical of thiophene, SC4H3–. Cf.:thenyl.
thienylalanine
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 ...
Thier
Carl Jörg, German physician. See Weyers-T. syndrome.
Thiers
Joseph, French physician, *1885. See Achard-T. syndrome.
Thiersch
Karl, German surgeon, 1822–1895. See T. graft, T. canaliculi, under canaliculus, Ollier-T. graft.
thiethylperazine maleate
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 ...
Thigh
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 ...
Thigh bone
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 ...
thigmesthesia
Sensibility to touch. [G. thigma, touch, + aisthesis, sensation]
thigmotaxis
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]
thigmotropism
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]
thimerosal
An antiseptic. SYN: thiomersal, thiomersalate.
thinking
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.. - ...
thinning
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 ...
thio-
Prefix denoting the replacement of oxygen by sulfur in a compound. Cf.:thia-. [G. theion, sugar]
thioacid
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).
thioalcohol
SYN: mercaptan (1).
thioamide
An amide in which S replaces O.
thioate
A salt or ester of a -thioic acid.
thiobarbiturates
Hypnotics of the barbiturate group, e.g., thiopental, in which the oxygen atom at carbon-2 is replaced by sulfur.
thiocarbamide
SYN: thiourea.
thiocarlide
A synthetic compound whose molecule contains the three antituberculous groups p-aminosalicylic acid, p-aminobenzaldehyde thiosemicarbazone, and the thiocarbamide group; an ...
thiochrome
A fluorescent compound, produced by the oxidation of thiamin; used in methods for detection and determination of thiamin.
thioctic acid
SYN: lipoic acid.
thiocyanate
A salt of thiocyanic acid. SYN: rhodanate, sulfocyanate.
thiocyanic acid
HS–CN; hydrogen thiocyanate. SYN: rhodanic acid, sulfocyanic acid.
thiodepsipeptide
Peptides that also contain one or more acylated thiol groups ( E.G., of cysteine). [ thio- + G. depseo, to knead, blend, + peptide]
thiodiphenylamine
SYN: phenothiazine.
thioester
An acylated thiol; RCOSR′; E.G., acetyl-CoA. SYN: acylmercaptan.
thioesterase
An enzyme that hydrolyzes thioesters; E.G., the deacylating activity at the end of fatty acid biosynthesis that releases palmitate. SYN: thiolesterase.
thioesters
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 ...
thioethanolamine acetyltransferase
An enzyme transferring acetyl from acetyl-CoA to the sulfur atom of thioethanolamine, thus producing coenzyme A and S-acetylthioethanolamine. SYN: thiotransacetylase B.
thioether
An organic sulfide; an ether in which the oxygen is replaced by sulfur; R—S—R′.
thioflavin T
A yellow thiazole dye, used in histopathology as a fluorochrome for hyaline and amyloid.
thioflavine S
A methylated and sulfonated derivative of primulin; a yellowish dye used in fluorescence microscopy as a vital stain.
thiofuran
SYN: thiophene.
thioglucosidase
An enzyme in mustard seed that converts thioglycosides into thiols plus sugars. SYN: myrosinase, sinigrase, sinigrinase.
thioglycerol
SYN: monothioglycerol.
thioglycolate, thioglycollate
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. ...
thioglycolic acid
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 ...
thioguanine
An antineoplastic agent used for leukemias and nephrosis.
thiokinase
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.
thiol
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 ...
thiolase
SYN: acetyl-CoA acetyltransferase.
thiole
SYN: thiophene.
thiolesterase
SYN: thioesterase.
thiolhistidylbetaine
SYN: ergothioneine.
thioltransacetylase A
SYN: dihydrolipoamide S-acetyltransferase.
thiolysis
The cleavage of a chemical bond with the addition of coenzyme A to one part; analogous to hydrolysis and phosphorolysis.
thiomersal
SYN: thimerosal.
thiomersalate
SYN: thimerosal.
thiomethyladenosine
SYN: methylthioadenosine.

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