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thionein
The apoprotein of metallothionein.
thioneine
SYN: ergothioneine.
thionic
Relating to sulfur.
thionine
Amidophenthiazine; a dark-green powder, giving a purple solution in water; useful as a basic stain in histology for chromatin and mucin because of its metachromatic ...
thiono-
Prefix sometimes used for thioxo-.
thiopanic acid
SYN: pantoyltaurine.
thiopental sodium
An ultra–short-acting barbiturate administered intravenously or rectally for induction of anesthesia.
thiophene
The fundamental ring compound. SYN: thiofuran, thiole.
thiophenicol
SYN: thiamphenicol.
thiopropazate hydrochloride
A phenothiazine derivative related chemically and pharmacologically to prochlorperazine and perphenazine; an antipsychotic.
thioproperazine
An antiemetic and antianxiety agent.
thioredoxin
A protein that participates in the oxidation-reduction reactions associated with the biosynthesis of deoxyribonucleotides. - t. reductase a flavoprotein that uses NADPH to ...
thioridazine hydrochloride
An antipsychotic with action similar to that of chlorpromazine but with relatively stronger anticholinergic effects.
thiosemicarbazide
One of the group of thiosemicarbazones with a tuberculostatic action; used as a reagent in the detection of metals.
thiosemicarbazone
1. A compound containing the thiosemicarbazide radical, =N—NH—C(S)—NH2. 2. One of a group of tuberculostatic drugs that includes thiosemicarbazide, benzaldehyde t., and ...
thiosulfate
S2O3=; the anion of thiosulfuric acid; elevated in individuals with a molybdenum cofactor deficiency. - t. cyanide transsulfurase SYN: t. sulfurtransferase. - t. ...
thiosulfuric acid
H2S2O3; sulfuric acid in which an atom of oxygen has been replaced by one of sulfur.
thiotepa
SYN: triethylenethiophosphoramide.
thiothixene
An antipsychotic.
thiotransacetylase B
SYN: thioethanolamine acetyltransferase.
thiourea
An antithyroid compound of the thioamide group, with the same actions and uses as thiouracil. Several derivatives of t. are useful in the treatment of leprosy. SYN: ...
Thioxanthene
One of a group of drugs with antipsychotic activity which act by blocking postsynaptic (after-the-nerve) receptors for dopamine (a chemical that nerves use to communicate with ...
thioxo-
Prefix indicating =S in a thioketone.
thioxolone
An antiseborrheic.
THIP
An agonist at γ-aminobutyric acid ( GABA) type A receptors. Unlike other agonists of this type, upon systemic administration T. penetrates the blood-brain barrier and is used ...
thiphenamil hydrochloride
An anticholinergic drug.
Third and fourth pharyngeal pouch syndrome
Also called the DiGeorge syndrome (DGS), this disorder is characterized by (1) low blood calcium levels (hypocalcemia) due to underdevelopment (hypoplasia) of the parathyroid ...
Third cranial nerve
Nerve, third cranial: The third cranial nerve is the oculomotor nerve. The cranial nerves emerge from or enter the skull (the cranium), as opposed to the spinal nerves which ...
Third stage of labor
The part of labor from the birth of the baby until the placenta (afterbirth) and fetal membranes are delivered. The third stage of labor is also called the placental stage.
Third ventricle
One cavity in a system of four communicating cavities within the brain that are continuous with the central canal of the spinal cord. The four ventricles consist of two lateral ...
thirst
A desire to drink associated with uncomfortable sensations in the mouth and pharynx. [A.S. thurst] - false t. t. that is not satisfied by drinking or taking water; t. associated ...
Thiry
Ludwig, Austrian physiologist, 1817–1897. See T. fistula, T.- Vella fistula.
thixolabile
Susceptible to thixotropy.
thixotropic
Pertaining to, or characterized by, thixotropy.
thixotropy
The property of certain gels of becoming less viscous when shaken or subjected to shearing forces and returning to the original viscosity upon standing ( e.g., synovial fluid, ...
Thogotoviruses
A group of unclassified viruses that are similar to the Orthoviruses and share some amino acid homology.
Thoma
Richard, German histologist, 1847–1923. See T. ampulla, T. fixative, T. laws, under law.
Thomas
Hugh Owen, British surgeon, 1834–1891. See T. splint.
Thompson
Sir Henry, English surgeon, 1820–1904. See T. test.
Thomsen
Asmus J., Danish physician, 1815–1896. See T. disease.
Thomson
Matthew Sidney, English dermatologist, 1894–1969. See Rothmund-T. syndrome. Frederic H., English physician, 1867–1938. See T. sign.
thonzonium bromide
A surface-active agent used in ear drops and aerosols.
thonzylamine hydrochloride
An antihistamine at H1 receptors.
thorac-
See thoraco-.
thoracal
SYN: thoracic.
thoracalgia
Pain in the chest. SYN: thoracodynia. [thoraco- + G. algos, pain]
Thoracentesis
: Removal of fluid in the pleura through a needle. * * * Paracentesis of the pleural cavity. SYN: pleuracentesis, pleural tap, pleurocentesis, thoracocentesis. [thoraco- + G. ...
thoracic
Relating to the thorax. SYN: thoracal.
Thoracic aneurysm
A local widening and bulging of a vessel (an aneurysm) within the thorax (chest). See: Aortic aneurysm. An aneurysm is a localized widening (dilatation) of an artery, vein, or the ...
Thoracic aorta
The thoracic aorta is a section of the aorta, the largest artery in the body, within the chest. Specifically, the thoracic aorta is that part of the aorta that starts after the ...
Thoracic duct
A vascular structure which recirculates lymph into the blood stream. It begins in the abdomen and tracks alongside the aorta and esophagus to eventually join with the left ...
Thoracic outlet syndrome
A condition due to compromise of blood vessels or nerve fibers between the armpit (axilla) and base of the neck, usually due to compression of nerves or blood vessels between the ...
Thoracic vertebrae
The 12 thoracic vertebrae are situated between the cervical (neck) vertebrae and the lumbar vertebrae. The thoracic vertebrae are represented by the symbols T1 through T12. The ...
thoracico-
See thoraco-.
thoracicoabdominal
SYN: thoracoabdominal.
thoracicoacromial
SYN: thoracoacromial.
thoracicohumeral
Relating to the thorax and the humerus.
thoraco-, thorac-, thoracico-
The chest (thorax). [G. thorax]
thoracoabdominal
Relating to the thorax and the abdomen. SYN: thoracicoabdominal.
thoracoacromial
Relating to the acromion and the thorax; denoting especially the t. artery. SYN: acromiothoracic, thoracicoacromial.
thoracoceloschisis
A congenital fissure of the trunk involving both the thoracic and abdominal cavities. SYN: thoracogastroschisis. [thoraco- + G. koilia, belly, + schisis, fissure]
thoracocentesis
SYN: thoracentesis.
thoracocyllosis
A deformity of the chest. [thoraco- + G. kyllosis, a crippling]
thoracocyrtosis
Abnormally wide curvature of the chest wall. [thoraco- + G. kyrtosis, a being crooked]
thoracodelphus
SYN: thoradelphus.
thoracodorsal
Relating to the external posterior chest wall, denoting especially an artery, vein, and nerve.
thoracodynia
SYN: thoracalgia. [thoraco- + G. odyne, pain]
thoracogastroschisis
SYN: thoracoceloschisis. [thoraco- + G. gaster, belly, + schisis, fissure]
thoracolaparotomy
Exposure of diaphragmatic region by an incision that opens both thorax and abdomen ( thoracoabdominal incision). [thoraco- + laparotomy]
thoracolumbar
1. Relating to the thoracic and lumbar portions of the vertebral column. 2. Relating to the origins of the sympathetic division of the autonomic nervous system. See autonomic ...
Thoracolumbosacral orthosis (TLSO)
One of the two main types of braces used to correct the lateral (sideways) curve of the spine in scoliosis. Patients can wear this brace to correct spinal curves whose apex is ...
thoracolysis
Breaking up of pleural adhesions. [thoraco- + G. lysis, dissolution]
thoracomelus
Unequal conjoined twins in which the parasite, often only a single arm or leg, is attached to the thorax of the autosite. See conjoined twins, under twin. [thoraco- + G. melos, ...
thoracometer
An instrument for measuring the circumference of the chest or its variations in respiration. [thoraco- + G. metron, measure]
thoracomyodynia
Pain in the muscles of the chest wall. [thoraco- + G. mys, muscle, + odyne, pain]
thoracopagus
Conjoined twins with union in the thoracic region. See conjoined twins, under twin. SYN: synthorax. [thoraco- + G. pagos, something fastened]
thoracoparacephalus
Unequal conjoined twins in which a rudimentary parasitic head is attached to the thorax of the autosite. See conjoined twins, under twin. [thoraco- + G. para, beside, + kephale, ...
thoracopathy
Rarely used term. Any disease of the thoracic organs or tissues. [thoraco- + G. pathos, suffering]
thoracoplasty
An operation that reduces intrathoracic space by removal of portions of the rigid chest wall. [thoraco- + G. plastos, formed] - conventional t. resection of ribs to allow inward ...
thoracopneumoplasty
Plastic surgery of the chest in which the lung is also involved. [thoraco- + G. pneumon, lung, + plastos, formed]
thoracoschisis
Congenital fissure of the chest wall. [thoraco- + G. schisis, fissure]
thoracoscope
An endoscope for viewing intrathoracic structures; may be video-assisted. [thoraco- + G. skopeo, to view]
thoracoscopy
Examination of the pleural cavity with an endoscope. SYN: pleuroscopy. [thoraco- + G. skopeo, to view]
thoracostenosis
Narrowness of the chest. [thoraco- + G. stenosis, narrowing]
thoracosternotomy
Chest incision combining an intercostal incision and transsection of the sternum. - transverse t. chest incision combining an intercostal incision and transsection of the ...
thoracostomy
Establishment of an opening into the chest cavity, as for the drainage of an empyema. [thoraco- + G. stoma, mouth]
thoracotomy
Incision through the chest wall into the pleural space. SYN: pleurotomy. [thoraco- + G. tome, incision] - anterior t. anterior incision into the chest, usually submammary. - ...
thoradelphus
Duplicitas posterior in which the individual is duplicated from the navel downward. See conjoined twins, under twin. SYN: thoracodelphus. [thoraco- + G. adelphos, brother]
thorax
The upper part of the trunk between the neck and the abdomen; it is formed by the 12 thoracic vertebrae, the 12 pairs of ribs, the sternum, and the muscles and fasciae attached to ...
thorium
A radioactive metallic element; atomic no. 90, atomic wt. 232.0381. 232Th, the only naturally occurring nuclide, with a half-life of 14 × 109 years, is used in colloidal form in ...
Thormählen
Johann, 19th century German physician. See T. test.
Thorn
George W., U.S. physician, *1906. See T. test, T. syndrome.
thorn
In anatomy, a thornlike or spinous structure. - dendritic thorns SYN: dendritic spines, under spine.
thorn apple
SYN: Datura stramonium.
Thornwaldt
Gustavus Ludwig. See Tornwaldt.
thought
1. The faculty of reasoning. 2. The process or act of thinking. 3. The result of thinking. - t. broadcasting the delusion of experiencing one's thoughts, as they occur, as ...
Thr
Symbol for threonine or its radical forms.
thread
1. A fine strand of suture material. 2. A filamentous structure. [M.E., fr. A.S. thraed] - terminal t. SYN: terminal filum.
threadworm
Common name for species of the genus Strongyloides; sometimes applied to any of the smaller parasitic nematodes.
threonic acid
The acid derived by oxidation of the CHO group of threose to COOH; a product of the oxidation of ascorbic acid by hypoiodite.
threonine
2-Amino-3-hydroxybutyric acid; the l-isomer is one of the naturally occurring amino acid s, included in the structure of most proteins, and nutritionally essential in the diet of ...
threose
An aldotetrose; one of the two aldoses (the other is erythrose) containing four carbon atoms.
threshold
1. The point at which a stimulus first produces a sensation. 2. The lower limit of perception of a stimulus. 3. The minimal stimulus that produces excitation of any structure; ...
thrill
A vibration accompanying a cardiac or vascular murmur that can be palpated. SEE ALSO: fremitus. - diastolic t. a t. felt over the precordium or over a blood vessel during ...
Thrive, failure to (FTT)
Refers to a child whose physical growth is significantly less than that of peers. There is no official consensus on what constitutes FTT. It usually refers to a child whose ...
thrix
SYN: hair. [G.]
throat
1. The fauces and pharynx. SYN: gullet. 2. The anterior aspect of the neck. SYN: jugulum. 3. Any narrowed entrance into a hollow part. [A.S. throtu] - sore t. a condition ...
throb
1. To pulsate. 2. A beating or pulsation.
thromb-
See thrombo-.
thrombase
SYN: thrombin.
thrombasthenia
An abnormality of platelets characteristic of Glanzmann t.. SEE ALSO: Bernard- Soulier syndrome. SYN: thromboasthenia. [ thromb- + G. astheneia, weakness] - Glanzmann t. ...
thrombectomy
The excision of a thrombus. [ thromb- + G. ektome, excision]
Thrombi
Just the plural of thrombus. See: Thrombus. * * * Plural of thrombus.
Thrombin
A key clot promoter, thrombin is an enzyme that presides over the conversion of a substance called fibrinogen to fibrin, the right stuff for a clot. * * * 1. An enzyme ...
Thrombinogen
Better known today as prothrombin, a coagulation (clotting) factor needed for the normal clotting of blood. There is a cascade of biochemical events that leads to the formation ...
thrombinogenesis
Thrombin production.
thrombo-, thromb-
Blood clot; coagulation; thrombin. [G. thrombos, clot (thrombus)]
thromboangiitis
Inflammation of the intima of a blood vessel, with thrombosis. [thrombo- + G. angeion, vessel, + -itis, inflammation] - t. obliterans inflammation of the entire wall and ...
thromboarteritis
Arterial inflammation with thrombus formation.
thromboasthenia
SYN: thrombasthenia.
thromboblast
SYN: megakaryocyte. [thrombo- + G. blastos, germ]
thromboclastic
SYN: thrombolytic.
thrombocyst, thrombocystis
A membranous sac enclosing a thrombus. [thrombo- + G. kystis, a bladder]
thrombocytasthenia
A term for a group of hemorrhagic disorders in which the platelets may be only slightly reduced in number, or even within the normal range, but are morphologically abnormal, or ...
Thrombocyte
A platelet. Crucial to normal blood clotting. Although platelets are sometimes classed as blood cells, they are not. They are fragments of a large cell called a megakaryocyte ...
thrombocythemia
SYN: thrombocytosis. [ thrombocyte + G. haima, blood]
thrombocytin
SYN: serotonin.
thrombocytopathy
General term for any disorder of the coagulating mechanism that results from dysfunction of the blood platelets. [ thrombocyte + G. pathos, suffering]
thrombocytopenia
A condition in which there is an abnormally small number of platelets in the circulating blood. SYN: thrombopenia. [ thrombocyte + G. penia, poverty] - autoimmune neonatal t. ...
Thrombocytopenic purpura, acute (ATP)
Sudden onset of low blood platelet levels with bleeding into the skin and elsewhere. ATP is due to many causes. It may, for example, constitute a potentially serious complication ...
thrombocytopoiesis
The process of formation of thrombocytes or platelets. [ thrombocyte + G. poiesis, a making]
thrombocytosis
An increase in the number of platelets in the circulating blood. SYN: thrombocythemia. [ thrombocyte + G. -osis, condition]
thromboelastogram
Registration of the coagulation process by a thromboelastograph.
thromboelastograph
Apparatus for registering elastic variations of a thrombus during the process of coagulation. [ thromb- + G. elastreo, to push, + grapho, to write]
thromboembolectomy
Extraction of an embolic thrombus. [thrombo- + G. embolos, embolus, + ektome, excision]
thromboembolism
Embolism from a thrombus. [thrombo- + G. embolismos, embolism]
thromboendarterectomy
An operation that involves opening an artery, removing an occluding thrombus along with the intima and atheromatous material, and leaving a clean, fresh plane internal to the ...
thromboendocarditis
SYN: nonbacterial thrombotic endocarditis.
thrombogen
SYN: prothrombin. [thrombo- + G. -gen, producing]
thrombogene
SYN: factor V.
thrombogenic
1. Relating to thrombogen. 2. Causing thrombosis or coagulation of the blood.
thromboid
Resembling a thrombus. [thrombo- + G. eidos, resemblance]
thrombokatilysin
Obsolete term for factor VIII.
thrombokinase
SYN: thromboplastin.
thrombolic
Relating to a thrombolus.
thrombolus
An embolus composed mainly of agglutinated platelets. [thrombo- + G. embolos, embolus]
thrombolymphangitis
Inflammation of a lymphatic vessel with the formation of a lymph clot.
thrombolysis
Fluidifying or dissolving of a thrombus. [thrombo- + G. lysis, a dissolving]
thrombolytic
Breaking up or dissolving a thrombus. SYN: thromboclastic.
Thrombolytic agents
Medications such as plasminogen-activator (t-PA) and streptokinase that are effective in dissolving clots (thrombi) and re-opening arteries. Thrombolytic agents are used, for ...
thrombomodulin
A glycoprotein present in the plasma membrane of endothelial cells that binds thrombin; participates in an additional regulatory mechanism in coagulation. [thrombo- + odulate + ...
thrombon
An all-inclusive term for circulating thrombocytes (blood platelets) and the cellular forms from which they arise (thromboblasts or megakaryocytes). It is analogous to erythron ...
thrombonecrosis
Necrosis of the walls of a blood vessel, with thrombosis in the lumen.
thrombopathy
A nonspecific term applied to disorders of blood platelets resulting in defective thromboplastin, without obvious change in the appearance or number of platelets. [thrombo- + G. ...
thrombopenia
SYN: thrombocytopenia.
Thrombophilia
The tendency to form blood clots (thrombosis). The clots can break off, travel through the bloodstream and lodge in any artery of the body (thromboembolism) and impair the normal ...
Thrombophlebitis
: Inflammation of a vein that occurs when a blood clot forms. * * * Venous inflammation with thrombus formation. [thrombo- + G. phleps, vein, + -itis, inflammation] - t. migrans ...
thromboplastid
1. SYN: platelet. 2. A nucleated spindle cell in submammalian blood. [thrombo- + G. plastos, formed]
thromboplastin
A substance present in tissues, platelets, and leukocytes necessary for the coagulation of blood; in the presence of calcium ions t. is necessary for the conversion of ...
thromboplastinogen
Obsolete term for factor VIII.
thrombopoiesis
Precisely, the process of a clot forming in blood, but generally used with reference to the formation of blood platelets (thrombocytes). [thrombo- + G. poiesis, a making]
thrombopoietin
A cytokine that serves as a humoral regulator for the production of blood platelets through action on the receptor c-mp1. SYN: megakaryocyte growth and development factor, ...
thrombosed
1. Clotted. 2. Denoting a blood vessel that is the seat of thrombosis.
thromboses
Plural of thrombosis.
thrombosin
SYN: thrombin.
thrombosis
Formation or presence of a thrombus; clotting within a blood vessel which may cause infarction of tissues supplied by the vessel. [G. t., a clotting, fr. thrombos, clot] - ...
Thrombosis, cavernous sinus
A cavernous sinus thrombosis is a blood clot within the cavernous sinus, a large channel of venous blood in a cavity bordered by the sphenoid bone and the temporal bone of the ...
Thrombospondin
One of a family of glycoproteins (carbohydrates complexed with proteins) that are made in cells, secreted by cells, and incorporated into cells including blood platelets ...
thrombostasis
Local arrest of the circulation by thrombosis. [thrombo- + G. stasis, a standing]
thrombosthenin
SYN: platelet actomyosin.
thrombotic
Relating to, caused by, or characterized by thrombosis.
Thrombotic disease due to protein C deficiency
Protein C is a protein in plasma that enters into the cascade of biochemical events leading to the formation of a clot. Deficiency of protein C results in thrombotic (clotting) ...
Thrombotic thrombocytopenic purpura (TTP)
A life-threatening disease involving embolism and thrombosis (plugging) of the small blood vessels in the brain. TTP is characterized by platelet microthrombi (tiny traveling ...
thrombotonin
SYN: serotonin.
thromboxane
The formal parent of the thromboxanes; prostanoic acid in which the –COOH has been reduced to –CH3 and an oxygen atom has been inserted between carbons 11 and 12.
thromboxanes
A group of compounds, included in the eicosanoids, formally based on thromboxane, but with the terminal COOH group present; biochemically related to the prostaglandins and ...
thrombozyme
SYN: thromboplastin.
thrombus
A clot in the cardiovascular systems formed during life from constituents of blood; it may be occlusive or attached to the vessel or heart wall without obstructing the lumen ( ...
throughput
A term applied to analytic instruments specifying the number of tests that can be performed in a given time.
thrush
Infection of the oral tissues with Candida albicans; often an opportunistic infection in humans with AIDS or humans suffering from other conditions that depress the immune ...
thuja
The fresh tops of T. occidentalis (family Pinaceae), an ornamental evergreen tree of eastern North America, a source of cedar leaf oil; has been used internally as an ...
thujol
SYN: thujone.
thujone
C10H16O; the chief constituent of cedar leaf oil; a stimulant and convulsant similar to camphor. SYN: absinthol, tanacetol, tanacetone, thujol, thuyol, thuyone.
thulium
A metallic element of the lanthanide series, atomic no. 69, atomic wt. l68.93421. [L. Thule, the earliest name for Scandinavia]
thumb
The first digit on the radial side of the hand. SYN: pollex [TA], digitus ( manus) primus, first finger. [A.S. thuma] - bifid t. a congenital malformed t. where the distal ...
thumbprinting
A radiographic sign of intestinal ischemia associated with hematoma formation and edema in the bowel wall; the thickened or edematous tissues encroach on the air- or ...
thumps
Spasmodic contractions of the diaphragm, or hiccups, occasionally seen in animals.
thus
SYN: olibanum. [L. incense]
thuya
SYN: thuja.
thuyol, thuyone
SYN: thujone.
Thy
Abbreviation for thymine.
Thygeson
Phillips, U.S. ophthalmologist, *1903. See T. disease.
thym-
See thymo-.
thyme
The dried leaves and flowering tops of Thymus vulgaris (family Labiatae), used as a condiment; it contains a volatile oil (t. oil) and is a source of thymol. [G. thymon, t.] - ...
thymectomy
Removal of the thymus gland. [ thymus + G. ektome, excision] - extended t. t. performed via combined sternotomy and a cervical incision to allow removal of all extraglandular ...
thymelcosis
Obsolete term for suppuration of the thymus gland. [ thymus + G. helkosis, ulceration]
thymi-
See thymo-.
thymic
Relating to the thymus gland.
thymic acid
SYN: thymol. [see thyme]
thymicolymphatic
Relating to the thymus and the lymphatic system.
thymidine
1-(2-Deoxyribosyl)thymine; one of the four major nucleosides in DNA (the others being deoxyadenosine, deoxycytidine, and deoxyguanosine). SYN: deoxythymidine, thymine ...
thymidine 5′-diphosphate
Thymidine esterified at its 5′ position with diphosphoric acid.
thymidine 5′-monophosphate
SYN: thymidylic acid.
thymidine 5′-triphosphate
Thymidine esterified at its 5′ position with triphosphoric acid; the immediate precursor of thymidylic acid in DNA.
thymidylate synthase
An enzyme catalyzing conversion of deoxyuridine 5′-monophosphate to thymidine 5′-monophosphate, the methyl group coming from N5,N10-methylenetetrahydrofolate.
thymidylic acid
A major constituent of DNA. SYN: thymidine 5′-monophosphate, thymine nucleotide.
thymin
See thymopoietin.
thymine
5-Methyluracil; a constituent of thymidylic acid and DNA; elevated in hyperuracil thyminuria. - t. deoxyribonucleoside SYN: thymidine. - t. deoxyribonucleotide SYN: ...
Thymine (T)
One member of the base pair A-T (adenine-thymine) in DNA.
thyminuria
See hyperuracil t..
thymitis
Inflammation of the thymus gland.
thymo-, thym-, thymi-
1. The thymus. [G. thymos] 2. Mind, soul, emotions. [G. thymos, the mind or heart as the seat of strong feelings or passions] 3. Wart, warty. [G. thymos, thymion]
thymocyte
A cell that develops in the thymus, seemingly from a stem cell of bone marrow and of fetal liver, and is the precursor of the thymus-derived lymphocyte (T lymphocyte) that ...
thymogenic
Of affective origin. [G. thymos, mind, + genesis, origin]
thymokinetic
Activating the thymus gland. [ thymus + G. kinesis, movement]
thymol
A phenol present in the volatile oil of Thymus vulgaris (thyme), Monarda punctata (horsemint), and other volatile oils; used externally and internally as an antiseptic, as a ...
thymoma
A neoplasm in the anterior mediastinum, originating from thymic tissue, usually benign, and frequently encapsulated; occasionally invasive, but metastases are rare; ...
thymonuclease
SYN: deoxyribonuclease I.
thymopoietin
Formerly called thymin; a polypeptide hormone that induces differentiation of lymphocytes to thymocytes. SEE ALSO: thymic lymphopoietic factor.
thymoprival, thymoprivic, thymoprivous
Relating to or marked by premature atrophy or removal of the thymus. [ thymus + L. privus, deprived of]
thymosin
A polypeptide hormone that restores T cell function in a thymectomized animal. SEE ALSO: thymic lymphopoietic factor.
thymoxamine
SYN: moxisylyte.
Thymus
: An organ in which lymphocytes mature and multiply. It lies behind the breastbone. * * * [NA] A primary lymphoid organ, located in the superior mediastinum and lower part of the ...
Thymus and parathyroids, hypoplasia of
Also known as the DiGeorge syndrome (DGS), this disorder is characterized by (1) low blood calcium levels (hypocalcemia) due to underdevelopment (hypoplasia) of the parathyroid ...
thyr-
See thyro-.
thyreo-
See thyro-.
thyro-, thyr-
The thyroid gland. [see thyroid]
thyroacetic acid
A degradation product of thyronine ( alanine side chain reduced to acetic acid), itself a degradation product (or precursor) of thyroxine.
thyroadenitis
SYN: thyroiditis. [thyro- + G. aden, gland, + -itis, inflammation]
thyroaplasia
Anomalies observed in individuals with congenital defects of the thyroid gland and deficiency of its secretion. [thyro- + G. a- priv. + plasis, a molding]
thyroarytenoid
Relating to the thyroid and arytenoid cartilages. See t. (muscle).
Thyrocalcitonin
A hormone, also called calcitonin, produced by the thyroid gland that lowers the levels of calcium and phosphate in the blood and promotes the formation of bone. Bone is in a ...
thyrocardiac
Affecting the heart as a result of hypo- or hyperthyroidism.
thyrocele
A tumor of the thyroid gland, such as a goiter. [thyro- + G. kele, tumor]
thyrocervical
Relating to the thyroid gland and the neck, denoting an arterial trunk.
thyrocolloid
A colloid substance in the thyroid gland.
thyroepiglottic
Relating to the thyroid cartilage and the epiglottis.
thyrofissure
SYN: laryngofissure.
thyrogenic, thyrogenous
Of thyroid gland origin. [thyroid + G. -gen, producing]
Thyroglobulin
A protein found in the thyroid gland. Some thyroglobulin can be found in the blood, and this amount may be measured after thyroid surgery to determine whether thyroid cancer has ...
thyroglossal
Relating to the thyroid gland and the tongue, denoting especially an embryologic duct. SYN: thyrolingual.
Thyroglossal cyst
A thyroglossal cyst is a fluid-filled sac that is present at birth and located in the midline of the neck. A thyroglossal cyst is a result of incomplete closure of a segment of ...
thyrohyal
The greater cornu of the hyoid bone.
thyrohyoid
Relating to the thyroid cartilage and the hyoid bone. See t. (muscle).
Thyroid
An adjective and a noun, pertaining to the thyroid gland or, less often today, to a preparation made of mammalian thyroid tissue to treat hypothyroidism. For example, the ...
Thyroid binding globulin
A blood protein that binds with the thyroid hormone thyroxine (T4).
Thyroid cartilage
The largest of the cartilages of the larynx (the voice box). The thyroid cartilage is formed of two approximately quadrilateral plates (called laminae) that are joined anteriorly ...
Thyroid hormone organification defect IIb
This condition, clinically called Pendred syndrome, is the hereditary association of congenital deafness (deafness at the time of birth) and goiter (enlargement of the thyroid ...
Thyroid scan
An image taken of the thyroid gland after radioactive iodine is taken by mouth. The thyroid gland is in front of the neck: {{}}Thyroid scanning is a nuclear medicine procedure. ...
Thyroid stimulating immunoglobulin (TSI)
A form of immunoglobulin G (IgG) that can bind to thyrotropin (TSH) receptors on the thyroid gland. TSIs mimic the action of TSH, causing excess secretion of thyroxine and ...
thyroidea
SYN: thyroid gland. - t. accessoria, t. ima SYN: accessory thyroid gland.
Thyroidectomy
The surgical removal of part or all of the thyroid gland. Subtotal thyroidectomy, the more commonly performed operation, involves removal of only a part of the gland. This ...
thyroidism
Obsolete designation for: 1. SYN: hyperthyroidism. 2. Poisoning by overdoses of a thyroid extract.
Thyroiditis
Inflammation of the thyroid gland which is located in front of the neck: . The inflamed thyroid gland can release an excess of thyroid hormones into the blood stream, resulting in ...
Thyroiditis, autoimmune
A progressive disease of the thyroid gland with antibodies in the blood stream directed against the thyroid and infiltration of the gland by lymphocytes (a key type of white blood ...
thyroidology
The study of the thyroid gland, both normal and pathologic. [thyroid + G. logos, study]
thyroidotomy
SYN: laryngofissure. [thyroid + G. tome, incision]
thyrointoxication
SYN: hyperthyroidism.
thyrolaryngeal
Relating to the thyroid gland or cartilage and the larynx.
thyroliberin
A tripeptide hormone from the hypothalamus, which stimulates the anterior lobe of the hypophysis to release thyrotropin; l-pyroglutamyl-l-histidyl-l-prolinamide. SYN: ...
thyrolingual
SYN: thyroglossal. [thyro- + L. lingua, tongue]
Thyrolingual cyst
A thyrolingual cyst is a fluid-filled sac that is present at birth and located in the midline of the neck. A thyrolingual cyst is a result of incomplete closure of a segment of ...
thyrolytic
Causing destruction of thyroid gland cells. [thyro- + G. lytikos, dissolving]
thyromegaly
Enlargement of the thyroid gland. [thyro- + G. megas, large]

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