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terato-
A teras. SEE ALSO: tera- (2). [G. teras, monster]
teratoblastoma
A tumor containing embryonic tissue differing from a teratoma in that not all germ layers are present.
teratocarcinoma
1. A malignant teratoma, occurring most commonly in the testis in association with embryonal carcinoma. 2. A malignant epithelial tumor arising in a teratoma.
Teratogen
Any agent that can disturb the development of an embryo or fetus. Teratogens may cause a birth defect in the child. Or a teratogen may halt the pregnancy outright. The classes of ...
Teratogen, coumadin as
The anticoagulant ("blood- thinner") coumadin is a known teratogen, an agent that can disturb the development of the embryo and fetus and lead to birth defects. Coumadin taken ...
Teratogen, Ecstasy as
Ecstasy is an illicit drug considered a recreational or party drug. It acts as both a stimulant and a hallucinogen. The chemical name is methylenedioxymethamphetamine (MDMA). ...
Teratogen, warfarin as
The anticoagulant warfarin (COUMADIN) is a known teratogen, an agent that can disturb the development of the embryo and fetus and lead to birth defects. Warfarin taken by a ...
teratogenesis
The origin or mode of production of a malformed conceptus; the disturbed growth processes involved in the production of a malformed neonate. [ terato- + G. genesis, origin]
Teratogenic drugs
A teratogen is an agent that can disturb the development of the embryo or fetus. Teratogens halt the pregnancy or produce a congenital malformation (a birth defect). Classes of ...
teratogenic, teratogenetic
1. Relating to teratogenesis. 2. Causing abnormal prenatal development.
teratogenicity
The property or capability of producing malformation. [ terato- + G. genesis, generation]
teratoid
Resembling a teras. [G. teratodes, fr. teras (terat-), monster, + eidos, resemblance]
teratologic
Relating to teratology.
teratology
The branch of science concerned with the production, development, anatomy, and classification of malformed conceptuses. SEE ALSO: dysmorphology. [ terato- + G. logos, study]
teratoma
A neoplasm composed of multiple tissues, including tissues not normally found in the organ in which it arises. Teratomas occur most frequently in the ovary, where they are usually ...
Teratoma, ovarian
Also called a dermoid cyst of the ovary, this is a bizarre tumor, usually benign, in the ovary that typically contains a diversity of tissues including hair, teeth, bone, ...
teratomatous
Relating to or of the nature of a teratoma.
Teratophobia
Fear of bearing a malformed child. A phobia is an unreasonable sort of fear that can cause avoidance and panic. Phobias are a relatively common type of anxiety disorder. Phobias ...
teratosis
An anomaly producing a teras. SYN: teratism. [ terato- + G. -osis, condition] - atresic t. a t. in which any of the normal orifices, such as the nares, mouth, anus, or vagina, ...
teratospermia
SYN: teratozoospermia. [ terato- + G. sperma, seed]
teratozoospermia
Condition characterized by the presence of malformed spermatozoa in the semen. SYN: teratospermia. [ terato- + zoos, living, + sperma, seed, semen, + -ia]
terazosin hydrochloride
A peripherally acting antiadrenergic used to treat benign prostatic hypertrophy and hypertension.
terbium
A metallic element of the lanthanide or rare earth series, atomic no. 65, atomic wt. 158.92534. [fr. Ytterby, a village in Sweden]
terbutaline sulfate
A sympathomimetic drug with relatively selective B2 agonistic activity, used principally as a bronchodilator or tocolytic agent.
terebene
A thin colorless liquid of an aromatic odor and taste, a mixture of terpene hydrocarbons, chiefly dipentene and terpinene, obtained from oil of turpentine; used as an ...
terebinthinate
1. Containing or impregnated with turpentine. 2. A preparation containing turpentine. SYN: terebinthine. [G. terebinthos, the terebinth or turpentine-tree]
terebinthine
SYN: terebinthinate.
terebinthinism
SYN: turpentine poisoning.
terebrant, terebrating
Boring; piercing; used figuratively, as in the term t. pain. [L. terebro, pp. -atus, to bore, fr. terebra, an auger]
terebration
1. The act of boring, or of trephining. 2. A boring, piercing pain. [L. terebro, to bore, fr. terebra, an auger]
teres
Round and long; denoting certain muscles and ligaments. See t. minor (muscle), t. major (muscle), round ligament of uterus, round ligament of liver, pronator t. (muscle). [L. ...
Teres minor muscle
A muscle that assists the lifting of the arm during outward turning (external rotation) of the arm. The tendon of the teres minor muscle is one of four tendons that stabilize the ...
terfenadine
An H1 antihistamine used to treat a variety of allergic conditions; has fewer sedative effects than other antihistamines, but in combination with several other drugs may cause ...
tergal
SYN: dorsal (1). [L. tergum, back]
tergum
SYN: dorsum. [L.]
term
1. A definite or limited period. 2. A name or descriptive word or phrase. SEE ALSO: terminus, t. infant. [L. terminus, a limit, an end]
terminad
Toward the terminus.
terminal
1. Relating to the end; final. 2. Relating to the extremity or end of any body; e.g., the end of a biopolymer. 3. A termination, extremity, end, or ending. [L. terminus, a ...
terminal deoxynucleotidyltransferase
SYN: DNA nucleotidylexotransferase.
Terminal ileitis
Crohn’s disease, a chronic inflammatory disease of the intestine involving only the end of the small intestine (the terminal ileum). Crohn’s disease affects primarily ...
terminatio
SYN: termination. SEE ALSO: ending. [L.] - terminationes nervorum liberae SYN: free nerve endings, under ending.
termination
An end or ending. A t. or ending, particularly a nerve ending. See ending. SYN: terminatio [TA]. [L. terminatio] - selective t. SYN: selective reduction.
Termination codon
A set of three adjacent bases in the DNA or their complementary bases in messenger RNA that specifies the end of a polypeptide chain. The three termination codons (in messenger ...
terminationes
Plural of terminatio. [L.]
Terminologia Anatomica
A system of anatomic nomenclature, consisting of about 7500 terms, devised and approved by the International Federation of Associations of Anatomists (IFAA) and promulgated in ...
terminus
A boundary or limit. [L.] - C t. the end of a peptide or protein having a free carboxyl (—COOH) group. - termini generales general terms; words that are of general use in ...
termolecular
Denoting three molecules; E.G., a t. reaction requires three molecules to come together in order for the reaction to occur. [L. ter, thrice, + molecular]
termone
A type of ectohormone, secreted by some invertebrate organisms, that stimulates gametogenesis. [L. ter, thrice, threefold, + hormone]
ternary
Denoting or comprised of three compounds, elements, molecules, etc. [L. ternarius, of three]
Ternidens
Nematode genus found in the intestine of several simian species in Africa, India, and Indonesia, and in humans in parts of Africa; differentiated from hookworms by the anteriorly ...
teroxide
SYN: trioxide.
terpene
One of a class of hydrocarbons with an empirical formula of C10H16, occurring in essential oils and resins. Acyclic terpenes may be regarded as isomers and polymers of isoprene ...
terpin
A cyclic terpene alcohol, C10H18(OH)2, obtained by the action of nitric acid and dilute sulfuric acid on pine oil. - t. hydrate monohydrate of t.; alleged to be an ...
terpineol
An unsaturated alcoholic terpene obtained by heating terpin hydrate with diluted phosphoric acid; an active antiseptic and a perfume.
terpinol
SYN: terpin hydrate.
terra japonica
See gambir.
terrace
To suture in several rows, in closing a wound through a considerable thickness of tissue. [thr. O. Fr. fr. L. terra, earth]
Terrey
Mary, 20th century U.S. physician. See Lowe-T.- MacLachlan syndrome.
Terrien
Louis-Felix, French surgeon, 1837–1908. See T. valve, T. marginal degeneration.
territoriality
1. The tendency of individuals or groups to defend a particular domain or sphere of interest or influence. 2. The tendency of an individual animal to define a finite space as ...
Terry
Theodore L., U.S. ophthalmologist, 1899–1946. See T. syndrome.
Terson
Albert, French ophthalmologist, 1867–1935. See T. glands, under gland.
tert-butyloxycarbonyl
SYN: t-butoxycarbonyl.
tertian
Recurring every third day, counting the day of an episode as the first; actually, occurring every 48 hours or every other day. [L. tertianus, fr. tertius, third] - double t. ...
tertiarism, tertiarismus
All the symptoms of the tertiary stage of syphilis taken collectively.
TESD
Abbreviation for total end- systolic diameter.
Tesla
Nikola, Serbian-American electrical engineer, 1856–1943. See t., T. current.
tesla
In the SI system, the unit of magnetic flux density expressed as kg s–2 A–1; equal to 1 Wb/m2. [N. T.]
tessellated
Made up of small squares; checkered. [L. tessella, a small square stone]
Tessier
Paul, 20th century French physician. See T. classification.
test
1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a ...
test letter
See test types.
test symbols
See test types.
test types
Letters of various sizes used to test visual acuity. - Jaeger t. type of different sizes used for testing the acuity of near vision. - point system t. a near-vision test chart ...
Test, auditory brainstem response (ABR)
A test for hearing and brain (neurological) functioning. ABR may be used in the evaluation of: {{}}Neurologic integrity (and hearing) in patients who are comatose, ...
Test, Brazelton
A widely used test of the newborn baby as to their neurologic status and developmental progress. The Brazelton newborn test is formally called the Neonatal Behavioral ...
Test, carcinoembryonic antigen
Carcinoembryonic antigen (CEA) is a protein found in many types of cells but associated with tumors and the developing fetus. CEA is tested in blood. The normal range is Benign ...
Test, CEA
CEA (carcinoembryonic antigen) is a protein found in many types of cells but associated with tumors and the developing fetus. CEA is tested in blood. The normal range is Benign ...
Test, child development
A test of the status of a newborn, an infant or young child as regards their developmental progress. One of the first tests was devised by the pioneering pediatrician and child ...
Test, Denver Developmental Screening
The Denver Developmental Screening Test (DDST) is a widely used assessment for examining children 0-6 years of age as to their developmental progress. The name "Denver" reflects ...
Test, EPO
A test of the hormone EPO (erythropoietin) in blood. The EPO level can indicate bone marrow disorders, kidney disease, or EPO abuse. Testing EPO blood levels is of value if: ...
Test, erythropoietin
A test of the hormone erythropoietin (EPO) in blood. An abnormal level of EPO may mean bone marrow or kidney disease or EPO abuse. Testing EPO blood levels is thus of value if: ...
Test, exercise
A test (sometimes called the treadmill test or exercise treadmill test) in which a continuous electrocardiogram (ECG or EKG) recording of the heart is made as the patient ...
Test, exercise treadmill
A test (sometimes simply called a treadmill test or exercise test) in which a continuous electrocardiogram (ECG or EKG) recording of the heart is made as the patient performs ...
Test, eye chart
This test measures how well you see at various distances. The eye chart itself — the usual one is called Snellen's chart — is imprinted with block letters that line-by-line ...
Test, eyedrop
: There are many types of eyedrops and many types of eyedrop tests. One of the most common eyedrop tests is pupil dilation. This examination enables your eye care professional to ...
Test, Fisher’s exact
A statistical test of independence much used in medical research. It tests the independence of rows and columns in a 2 X 2 contingency table (with 2 horizontal rows crossing 2 ...
Test, Gesell Developmental
A measure of child development devised by the American child psychologist and pediatrician Arnold Gesell (1880-1961) whyo founded the Clinic of Child Development at Yale in 1911 ...
Test, inkblot
A test used in clinical psychology and psychiatry involving inkblots. The inkblots are used to determine what a person perceives (reads into) in the enigmatic and highly ...
Test, NSE
Neuron-specific enolase (NSE) is a substance that has been detected in patients with certain tumors, namely: neuroblastoma, small cell lung cancer, medullary thyroid cancer, ...
Test, Pap
A screening test for cervical cancer based on the examination under the microscope of cells collected from the cervix, smeared on a slide and specially stained to reveal ...
Test, pharmacologic stress
There are a diversity of pharmacologic stress tests. Here this refers specifically to a pharmacologic cardiac stress test in which certain medications are administered that ...
Test, physiologic stress
Although there can be a diversity of physiologic stress tests, this refers here to a physiologic cardiac stress test in which certain medications are administered that stimulate ...
Test, prostate specific antigen
A test used to screen for cancer of the prostate and to monitor treatment. PSA is a protein produced by the prostate gland. Although most PSA is carried out of the body in ...
Test, pupil dilation
An examination that enables an eye care professional to see more of the retina, the light-sensitive layer of tissue at the back of the eye. Dilating (widening) the pupil permits ...
Test, radionucleide stress
This procedure involves injecting a radioactive isotope (typically thallium or cardiolyte) into the patient’s vein after which an image of the patient’s heart becomes visible ...
Test, rapid plasma reagin
A screening blood test for syphilis. Rapid plasma reagin is commonly abbreviated RPR. A negative ("nonreactive") RPR test result is compatible with a person not having ...
Test, rapid strep
A diagnostic test commonly used to demonstrate whether streptococcus bacteria ("strep") are present in the throat. A throat infection with strep needs to be treated with an ...
Test, Rorschach
A psychological test involving inkblots. The inkblots are used to determine what a person perceives (reads into) in the enigmatic and highly ambiguous shapes. Ten standardized ...
Test, RPR
Rapid plasma reagin, a blood test for syphilis that looks for an antibody that is present in the bloodstream when a patient has syphilis. A negative (nonreactive) RPR is ...
Test, stool occult blood
A test to see whether there is blood in the bowel movement. Also called a fecal occult blood test: A test to check for hidden blood in stool. (Fecal refers to stool. Occult ...
Test, stress echocardiography
A supplement to the routine exercise cardiac stress test. During stress echocardiography, the sound waves of ultrasound are used to produce images of the heart at rest and at ...
Test, sweat
A common and simple test used to evaluate a patient who is suspected of having cystic fibrosis (CF), the most common lethal genetic disease affecting Caucasians. Also called the ...
Test, sweat chloride
A common and simple test used to evaluate a patient who is suspected of having cystic fibrosis (CF), the most common lethal genetic disease affecting Caucasians. The goal of the ...
Test, syphilis (RPR)
Rapid plasma reagin, a blood test for syphilis that looks for an antibody that is present in the bloodstream when a patient has syphilis. A negative (nonreactive) RPR is ...
Test, syphilis (VDRL)
A blood test for syphilis (VDRL stands for Venereal Disease Research Laboratory) that detects an antibody that is present in the bloodstream when a patient has syphilis. A ...
Test, ThinPrep Pap
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 ...
Test, tilt-table
Tilt-table testing involves placing the patient on a table with a foot-support. The table is tilted upward and the blood pressure and pulse are measured and symptoms are recorded ...
Test, treadmill
A test (sometimes called the exercise treadmill test or exercise test) in which a continuous electrocardiogram (ECG or EKG) recording of the heart is made as the patient ...
Test, triglyceride
Triglycerides are the major form of fat. Triglycerides come from the food we eat and are produced by the body. Triglyceride levels are influenced by recent fat and alcohol ...
Test, VDRL
A blood test for syphilis (VDRL stands for Venereal Disease Research Laboratory) that detects an antibody that is present in the bloodstream when a patient has syphilis. A ...
Test, Venereal Disease Research Laboratory
A blood test for syphilis. Venereal Disease Research Laboratory is commonly abbreviated VDRL. A negative ("nonreactive") VDRL is compatible with a person not having syphilis. ...
Test, visual acuity
This test measures how well you see at various distances. It is the familiar eye chart test. The eye chart itself — the usual one is called Snellen's chart — is imprinted ...
Test, visual field
A test which measures the extent and distribution of the field of vision. The visual field test may be done by a number of methods including what are termed confrontation, ...
testa
1. In protozoology, usually termed test; an envelope of certain forms of ameboid protozoa, consisting of various earthy materials cemented to a chitinous base (as in the ...
Testacealobosia
A subclass of the subphylum Sarcodina (amebae), in which the cells are provided with a firm chitinous envelope, often containing earthy material, with an opening through ...
testalgia
SYN: orchialgia. [testis + G. algos, pain]
testcross
Crossing of an unknown genotype to a recessive homozygote so that the phenotype of the progeny corresponds directly to the chromosomes carried by the parents of unknown ...
testectomy
SYN: orchiectomy. [testis + G. G. ektome, excision]
Testes
: The male sex glands. They are located behind the penis in a pouch of skin called the scrotum. The testes produce and store sperm, and are also the body's main source of male ...
testicle
SYN: testis. [L. testiculus, dim. of testis]
Testicles
: The testicles (also called testes or gonads) are the male sex glands. They are located behind the penis in a pouch of skin called the scrotum. The testicles produce and store ...
testicular
Relating to the testes.
Testicular feminization syndrome
Now more appropriately called the complete androgen insensitivity syndrome, this is a genetic disorder that makes XY fetuses insensitive (unresponsive) to androgens (male ...
testiculus
SYN: testis. [L.]
testing
See test. - bench t. t. of a device against specifications in a simulated (nonliving) environment. - contrast sensitivity t. examination of the visual recognition of the variation ...
Testing, anonymous
Testing in which no name or other means is used to identify the person tested. There is total anonymity. For example, the State of Florida requires that each county have a site ...
Testis
: The testis (or testicle) is the male sex gland. A pair of testes are located behind the penis in a pouch of skin called the scrotum. The testes have two functions: one in ...
testitis
SYN: orchitis.
testoid
1. SYN: androgenic. 2. SYN: androgen. [testis + G. eidos, resemblance]
testolactone
An androgenic agent used as an antineoplastic agent for treatment of mammary carcinoma.
testosterone
The most potent naturally occurring androgen, formed in greatest quantities by the interstitial cells of the testes, and possibly secreted also by the ovary and adrenal cortex; ...
Testosterone replacement therapy
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 ...
testotoxicosis
A G protein mutation disease resulting in autonomous testosterone overproduction, with precocious puberty.
tetan-
See tetano-.
tetanic
Relating to or marked by a sustained muscular contraction, as in tetanus. [G. tetanikos]
tetaniform
SYN: tetanoid (1).
tetanigenous
Causing tetanus or tetaniform spasms. [ tetanus + G. -gen, producing]
tetanism
SYN: neonatal tetany.
tetanization
1. The act of tetanizing the muscles. 2. A condition of tetaniform spasm.
tetanize
To stimulate a muscle by a rapid series of stimuli so that the individual muscular responses (contractions) are fused into a sustained contraction; to cause tetanus (2) in a ...
tetano-, tetan-
Combining forms denoting tetanus, tetany. [G. tetanos, convulsive tension]
tetanoid
1. Resembling or of the nature of tetanus. SYN: tetaniform. 2. Resembling tetany. [tetano- + G. eidos, resemblance]
tetanolysin
A hemolytic principle, elaborated by Clostridium tetani, which seems to have no role in the etiology of tetanus.
tetanometer
An instrument for measuring the force of tonic muscular spasms. [tetano- + G. metron, measure]
tetanomotor
An instrument by means of which tonic spasms are produced by the mechanical irritation of a hammer striking the motor nerve of the muscle affected. [tetano- + L. motor, a mover]
tetanospasmin
The neurotoxin of Clostridium tetani, which causes the characteristic signs and symptoms of tetanus; chief action is on the anterior horn cells, and the spasms seem to be due ...
tetanotoxin
SYN: tetanus toxin. [tetano- + G. toxikon, poison]
Tetanus
An often fatal infectious disease caused by the bacteria Clostridium tetani (C. tetani) which usually enters the body through a puncture, cut, or open wound. Tetanus is ...
Tetany
: A combination of signs and symptoms, due usually to low calcium, that can include: {{}}Hyperreflexia (overactive neurological reflexes), Carpopedal spasm (spasms of the hands ...
tetra-
Four. [G. tetra-, four]
tetra-amelia
Absence of upper and lower limbs. [ tetra- + G. a- priv. + melos, limb]
tetrabasic
Denoting an acid having four acid groups and thereby being able to neutralize 4 Eq of base.
tetrabenazine
Formerly used as a tranquilizer; resembles reserpine in its actions but duration of effect is shorter.
tetraboric acid
Perboric or pyroboric acid. SYN: pyroboric acid.
tetrabrachius
An individual with four arms. [ tetra- + G. brachion, arm]
tetrabromophenolphthalein sodium
The sodium salt of a brominated dye; it was used early in the development of cholecystography.
tetracaine hydrochloride
A highly potent local anesthetic used for spinal, nerve block, and topical anesthesia.
tetrachirus
An individual with four hands. [ tetra- + G. cheir, hand]
tetrachlorethylene
An anthelmintic against hookworm and other nematodes. SYN: carbon dichloride, ethylene tetrachloride, tetrachloroethylene.
tetrachlormethiazide
A diuretic of the thiazide type. SYN: teclothiazide.
tetrachloroethane
Acetylene tetrachloride; a nonflammable solvent for fats, oils, waxes, resins, etc.; used in the manufacture of paint and varnish removers, photographic films, lacquers, and ...
tetrachloroethylene
SYN: tetrachlorethylene.
tetrachloromethane
SYN: carbon tetrachloride.
tetracoccus
An old term describing a spherical bacterium that divides in two planes and characteristically forms groups of four cells. [ tetra- + G. kokkos, berry]
tetracrotic
Denoting a pulse curve with four upstrokes in the cycle. [ tetra- + G. krotos, a striking]
tetracuspid
Having four cusps. SYN: quadricuspid.
tetracycline
A broad spectrum antibiotic (a naphthacene derivative), the parent of oxytetracycline, prepared from chlortetracycline and also obtained from the culture filtrate of several ...
tetrad
1. A collection of four things having something in common such as a deformity with four features, e.g., Fallot tetralogy. SYN: tetralogy. 2. In chemistry, a quadrivalent ...
tetradactyl
Having only four fingers or toes on a hand or foot. SYN: quadridigitate. [ tetra- + G. daktylos, finger or toe]
tetradecanoic acid
SYN: myristic acid.
tetradic
Relating to a tetrad.
tetraethyl pyrophosphate
An organic phosphoric compound used as an insecticide; a potent irreversible cholinesterase inhibitor.
tetraethylammonium chloride
A quaternary ammonium compound that partially blocks transmission of impulses through parasympathetic and sympathetic ganglia and is used in pharmacologic studies to block ...
tetraethyllead
An anti-knock compound added to motor fuel; has a toxic action causing anorexia, nausea, vomiting, diarrhea, tremors, muscular weakness, insomnia, irritability, nervousness, ...
tetraethylmonothionopyrophosphate
An anticholinesterase agent used in the treatment of glaucoma by local instillation in the eye.
Tetrafluoroethylene
A substance that is a possible carcinogen (cancer-causing agent) used in the production of polymers such as polytetrafluoroethylene. The US government in 2000 classified ...
tetragastrin
1. A tetrapeptide (Trp–Met–Asp–Phe–NH2) used to test the secretion of digestive juice. 2. A pterin derivative that is a required cofactor for a number of enzymes; ...
tetraglycine hydroperiodide
Dissolves in water to the extent of 380 g/L; used for the emergency disinfection of drinking water in amounts to yield 8 ppm of active iodine.
tetragon, tetragonum
Quadrangle; a figure having four sides. [ tetra- + G. gonia, angle] - t. lumbale a quadrangular space bounded laterally by the obliquus externus abdominis muscle, medially by ...
tetragonus
Obsolete term for platysma (muscle).
tetrahydric
Denoting a compound containing four ionizable hydrogen atoms (four acid groups).
tetrahydro-
Prefix denoting attachment of four hydrogen atoms; e.g., tetrahydrofolate (H4folate).
tetrahydrocannabinol
The Δ1-3,4-trans isomer and the Δ6-3,4-trans isomer are believed to be the active isomers present in Cannabis, having been isolated from marijuana. SEE ALSO: cannabis, ...
tetrahydrofolate methyltransferase
SYN: methionine synthase.
tetrahydrofolic acid
The active coenzyme form of folic acid; participates in one-carbon metabolism. SYN: coenzyme F.
tetrahydrozoline hydrochloride
A sympathomimetic agent related to ephedrine, used as a topical nasal and conjunctival decongestant; chronic excessive use may convert an acute congestion into a chronic ...
Tetrahymena pyriformis
A ciliate belonging to a large group characterized by three membranes on one side of the buccal cavity and one on the other; it somewhat resembles the paramecium and, like it, is ...
tetralogy
SYN: tetrad (1). [G. tetralogia] - Eisenmenger t. SYN: Eisenmenger complex. - t. of Fallot a set of congenital cardiac defects including ventricular septal defect, pulmonic ...
Tetralogy of Fallot
A combination of four heart defects that are present together at birth, accounting for about 10% of all congenital heart disease. The four defects that constitute the tetralogy ...
tetramastia
Presence of four breasts on an individual. [ tetra- + G. mastos, breast]
tetramastigote
A protozoan or other microorganism possessing four flagella. [ tetra- + G. mastix, whip]
tetramastous
Having four breasts.
tetramelus
Conjoined twins possessing four arms (tetrabrachius), or four legs (tetrascelus). See conjoined twins, under twin. [ tetra- + G. melos, limb]
Tetrameres
A genus of stomach-infecting parasitic nematodes (family Spiruridae) of birds. When filled with eggs, the female worm is enormously enlarged and has a globular, blood-red ...
tetrameric, tetramerous
Having four parts, or parts arranged in groups of four, or capable of existing in four forms. [ tetra- + G. meros, part]
tetramethylammonium iodide
Dissolves in water to the extent of 0.25 g/L; used for the emergency disinfection of drinking water.
tetramethyldiarsine
SYN: cacodyl.
tetramethylputrescine
A derivative of putrescine, C8H20N2, similar in its action to muscarine.
tetranitrol
SYN: erythrityl tetranitrate.
tetranucleotide
A compound of four nucleotides; once thought to represent the actual structure of nucleic acid (t. theory).
tetraotus
SYN: tetrotus.
tetraparesis
Weakness of all four extremities. SYN: quadriparesis.
tetrapeptide
A compound of four amino acid s in peptide linkage.
tetraperomelia
Peromelia involving all four extremities. [ tetra- + G. peros, maimed, + melos, limb]
tetraphocomelia
Phocomelia involving all four limbs.
tetraplegia
SYN: quadriplegia. [ tetra- + G. plege, stroke]
tetraplegic
SYN: quadriplegic.
tetraploid
See polyploidy. [G. tetraploos, fourfold, + eidos, form]
tetrapus
A malformed individual with four feet. [G. tetrapous, fr. tetra- + pous, foot]
tetrapyrrole
A molecule containing four pyrrole nuclei; e.g., porphyrin.
tetrasaccharide
A sugar containing four molecules of a monosaccharide; e.g., stachyose.
tetrascelus
A malformed individual with four legs. [ tetra- + G. skelos, leg]
tetrasomic
Relating to a cell nucleus in which one chromosome is represented four times while all others are present in the normal number. [ tetra- + chromosome]
tetraster
A figure exceptionally and abnormally occurring in mitosis, in which there are four asters. [ tetra- +G. aster, star]
tetrastichiasis
Duplication of the growth of the eyelashes (in four rows). [ tetra- + G. stichos, row]
tetraterpenes
Hydrocarbons or their derivatives formed by the condensation of eight isoprene units ( i.e., four terpenes) and therefore containing 40 carbon atoms; e.g., various carotenoids. ...
tetratomic
Denoting a quadrivalent element or radical. [ tetra- + G. atomos, atom]
Tetratrichomonas
A genus of parasitic protozoan flagellates, formerly part of the genus Trichomonas but now separated into a distinct genus by the presence of four anterior and one trailing ...
tetravalent
SYN: quadrivalent. [ tetra- + L. valentia, strength]
tetrazole
The compound CN4H2 with the structure of tetrazolium.
tetrazolium
Any of a group of organic salts having the general structure that on reduction (cleaving the 2,3 bond) yields a colored insoluble formazan; used as a reagent in oxidative ...
tetrodotoxin
A potent neurotoxin found in the liver and ovaries of the Japanese pufferfish, Sphoeroides rubripes, other species of pufferfish, and certain newts; produces axonal blocks of ...
tetrose
A monosaccharide containing only four carbon atoms in the main chain; e.g., erythrose, threose, erythrulose.
tetrotus
A malformed individual with four ears, four eyes, two faces, and two almost separate heads. SYN: tetraotus. [ tetra- + G. ous (ot-), ear]
tetroxide
An oxide containing four oxygen atoms; e.g., OsO4.
tetter
An outmoded colloquial term, popularly applied to ringworm and eczema, and occasionally applied to other eruptions. [A.S. teter]
Teutleben
F.E.K. von, German anatomist, 1842–?. See T. ligament.
textiform
Weblike. [L. textum, something woven]
textural
Relating to the texture of the tissues.
texture
The composition or structure of a tissue or organ. [L. textura, fr. texo, pp. textus, to weave]
textus
A tissue. [L.]
TGC
Abbreviation for time-varied gain control; time-gain compensation.
TGF
Abbreviation for transforming growth factors, under factor.
TGFα
Abbreviation for transforming growth factor α.
TGFβ
Abbreviation for transforming growth factor β.
Th
1. Abbreviation for T helper cells, under cell. 2. Symbol for thorium.
Thai hemorrhagic fever
A syndrome due to the dengue virus that tends to affect children under 10, causing abdominal pain, hemorrhage (bleeding) and circulatory collapse (shock). Known also as dengue ...
Thal
Alan P., U.S. surgeon, *1925. See T. procedure.
thalam-
See thalamo-.
thalamectomy
See chemothalamectomy. [thalamus + G. ektome, excision]
thalamencephalic
Relating to the thalamencephalon.
thalamencephalon
That part of the diencephalon comprising the thalamus and its associated structures. [thalamus + G. enkephalos, brain]
thalamic
Relating to the thalamus.
thalamo-, thalam-
The thalamus. [G. thalamos, bedroom (thalamus)]
thalamocortical
Relating to the efferent connections of the thalamus with the cerebral cortex.
thalamolenticular
Relating to the thalamus, usually the dorsal thalamus, and the lenticular nucleus ( putamen and globus pallidus).
thalamotomy
Destruction of a selected portion of the thalamus by stereotaxy for the relief of pain, involuntary movements, epilepsy, and, rarely, emotional disturbances; produces few, if ...
thalamus
The large, ovoid mass of gray matter that forms the larger dorsal subdivision of the diencephalon; it is placed medial to the internal capsule and the body and tail of the ...
Thalassemia
Not just one disease but rather a complex series of genetic (inherited) disorders all of which involve underproduction of hemoglobin, the indispensable molecule in red blood cells ...
Thalassemia major
The dire disease also known as beta thalassemia. The clinical picture of this form of anemia was first described in 1925 by the pediatrician Thomas Benton Cooley. Other names ...
Thalassemia minor
Also called thalassemia trait, thalassemia minor is the carrier state for beta thalassemia. People who are carriers (heterozygotes) have just one thalassemia gene, are said to ...
Thalassemia, alpha
A blood disorder, thalassemia is not one disease but rather a group of disorders that have a single feature in common: they all have a genetic defect in the production of ...
Thalassemia, beta
Also known as thalassemia major .The clinical picture of this important type of anemia was first described in 1925 by the pediatrician Thomas Benton Cooley.. Other names for the ...
thalassemia, thalassanemia
Any of a group of inherited disorders of hemoglobin metabolism in which there is impaired synthesis of one or more of the polypeptide chains of globin; several genetic types ...
thalassophobia
Morbid fear of the sea. [G. thalassa, the sea, + phobos, fear]
thalassoposia
SYN: mariposia. [G. thalassa, the sea, + posis, drinking]
thalassotherapy
Treatment of disease by exposure to sea air, by sea bathing, or by a sea voyage. [G. thalassa, the sea]
thalidomide
A hypnotic drug which, if taken in early pregnancy, may cause the birth of infants with phocomelia and other defects; under investigational use for treatment of leprosy and as ...
Thalidomide baby
An infant affected by prenatal exposure to the drug thalidomide. This medication was prescribed to pregnant women for treatment of morning sickness until removal from the market ...
thallic
Denoting conidia produced with no enlargement or growth after delimitation by septa in the hypha (thallus); the entire parent cell becomes an arthroconidium.

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