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Medical Dictionary


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thiosemicarbazone (thi′o-sem′e-kar′ba-zon)
1. A compound containing the thiosemicarbazide radical, &dbond;N—NH—C(S)—NH2. 2. One of a group of tuberculostatic drugs that includes thiosemicarbazide, benzaldehyde t., and 4-aminoacetylbenzaldehyde t..

thiosulfate (thi-o-sul′fat)
S2O3&dbond;;the anion of thiosulfuric acid; elevated in individuals with a molybdenum cofactor deficiency. t. cyanide transsulfurase SYN: t. sulfurtransferase. t. sulfurtransferase a transferase that catalyzes the formation of thiocyanate and sulfite from cyanide and t.. SYN: rhodanese, t. cyanide transsulfurase, t. thiotransferase. t. thiotransferase SYN: t. sulfurtransferase.

thiosulfuric acid (thi′o-sul-fur′ik)
H2S2O3;sulfuric acid in which an atom of oxygen has been replaced by one of sulfur.

thiotepa (thi-o-tep′a)
SYN: triethylenethiophosphoramide.

thiothixene (thi-o-thik′sen)
An antipsychotic.

thiotransacetylase B (thi′o-trans-a-set′i-las)
SYN: thioethanolamine acetyltransferase.

2-thiouracil (thi-o-ur′a-sil)
A rare component of transfer RNAs; a thioamide derivative that inhibits the synthesis of thyroid hormones; hence, a goitrogen; similar to propylthiouracil.

4-thiouracil (thi-o-ur′a-sil)
Uracil with S replacing O in position 4, isomeric with 2-thiouracil; a rare component of transfer RNAs.

thiourea (thi′o-u-re′a)
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: thiocarbamide.

thioxanthene (thi-o-zan′then)
A class of tricyclic compounds resembling phenothiazine, but with the central ring nitrogen replaced by a carbon atom; current use emphasizes the antipsychotic and antiemetic properties of this class.

thioxo-
Prefix indicating &dbond;S in a thioketone.

thioxolone (thi-ok′so-lon)
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 as a pharmacologic tool to explore GABA receptor function in the brain and spinal cord.

thiphenamil hydrochloride (thi-fen′a-mil)
An anticholinergic drug.

thirst (thurst)
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 with a dry mouth but not with a bodily need for water. SYN: pseudodipsia. insensible t. SYN: hypodipsia. morbid t. SYN: dipsesis. subliminal t. SYN: hypodipsia. true t. t. that can be satisfied by drinking water.

Thiry
Ludwig, Austrian physiologist, 1817–1897. See T. fistula, T.-Vella fistula.

thixolabile (thik-so-la′bil, -bil)
Susceptible to thixotropy.

thixotropic (thik-so-trop′ik)
Pertaining to, or characterized by, thixotropy.

thixotropy (thik-sot′ro-pe)
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, ferrous hydroxide gel); a characteristic of a system exhibiting a decrease in viscosity with an increase in the rate of shear, usually a function of time. SYN: reclotting phenomenon. [G. thixis, a touching, + trope, turning]

Thogotoviruses (tho-go-to-vi-rus-ez)
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.

Thomson
Frederic H., English physician, 1867–1938. See T. sign.

thonzonium bromide (thon-zo′ne-um)
A surface-active agent used in ear drops and aerosols.

thonzylamine hydrochloride (thon-zil′a-men)
An antihistamine at H1 receptors.

thorac-
See thoraco-.

thoracal (thor′a-kal)
SYN: thoracic.

thoracalgia (thor-a-kal′je-a)
Pain in the chest. SYN: thoracodynia. [thoraco- + G. algos, pain]

thoracentesis (thor′a-sen-te′sis)
Paracentesis of the pleural cavity. SYN: pleuracentesis, pleural tap, pleurocentesis, thoracocentesis. [thoraco- + G. kentesis, puncture]

thoracic (tho-ras′ik)
Relating to the thorax. SYN: thoracal.

thoracico-
See thoraco-.

thoracicoabdominal (tho-ras′i-ko-ab-dom′i-nal)
SYN: thoracoabdominal.

thoracicoacromial (thor-as′i-ko-a-kro′me-al)
SYN: thoracoacromial.

thoracicohumeral (tho-ras′i-ko-hu′mer-al)
Relating to the thorax and the humerus.

thoraco-, thorac-, thoracico-
The chest (thorax). [G. thorax]

thoracoabdominal (thor′a-ko-ab-dom′i-nal)
Relating to the thorax and the abdomen. SYN: thoracicoabdominal.

thoracoacromial (thor′a-ko-a-kro′me-al)
Relating to the acromion and the thorax; denoting especially the t. artery. SYN: acromiothoracic, thoracicoacromial.

thoracoceloschisis (thor′a-ko-se-los′ki-sis)
A congenital fissure of the trunk involving both the thoracic and abdominal cavities. SYN: thoracogastroschisis. [thoraco- + G. koilia, belly, + schisis, fissure]

thoracocentesis (thor′a-ko-sen-te′sis)
SYN: thoracentesis.

thoracocyllosis (thor′a-ko-si-lo′sis)
A deformity of the chest. [thoraco- + G. kyllosis, a crippling]

thoracocyrtosis (thor′a-ko-ser-to′sis)
Abnormally wide curvature of the chest wall. [thoraco- + G. kyrtosis, a being crooked]

thoracodelphus (thor′a-ko-del′fus)
SYN: thoradelphus.

thoracodorsal (thor-ak-o-dor′sal)
Relating to the external posterior chest wall, denoting especially an artery, vein, and nerve.

thoracodynia (thor′a-ko-din′e-a)
SYN: thoracalgia. [thoraco- + G. odyne, pain]

thoracogastroschisis (thor′a-ko-gas-tros′ki-sis)
SYN: thoracoceloschisis. [thoraco- + G. gaster, belly, + schisis, fissure]

thoracolaparotomy (thor′a-ko-lap-a-rot′o-me)
Exposure of diaphragmatic region by an incision that opens both thorax and abdomen (thoracoabdominal incision). [thoraco- + laparotomy]

thoracolumbar (thor′a-ko-lum′bar)
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 division of nervous system.

thoracolysis (thor-a-kol′i-sis)
Breaking up of pleural adhesions. [thoraco- + G. lysis, dissolution]

thoracomelus (thor-a-kom′e-lus)
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, limb]

thoracometer (thor-a-kom′e-ter)
An instrument for measuring the circumference of the chest or its variations in respiration. [thoraco- + G. metron, measure]

thoracomyodynia (thor′a-ko-mi-o-din′e-a)
Pain in the muscles of the chest wall. [thoraco- + G. mys, muscle, + odyne, pain]

thoracopagus (thor-a-kop′a-gus)
Conjoined twins with union in the thoracic region. See conjoined twins, under twin. SYN: synthorax. [thoraco- + G. pagos, something fastened]

thoracoparacephalus (thor′a-ko-par-a-sef′a-lus)
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, head]

thoracopathy (thor-a-kop′a-the)
Rarely used term. Any disease of the thoracic organs or tissues. [thoraco- + G. pathos, suffering]

thoracoplasty (thor′a-ko-plas-te)
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 retraction of the chest wall to reduce size of the pleural space; may be used in the treatment of empyema.

thoracopneumoplasty (thor′a-ko-noo′mo-plas-te)
Plastic surgery of the chest in which the lung is also involved. [thoraco- + G. pneumon, lung, + plastos, formed]

thoracoschisis (thor-a-kos′ki-sis)
Congenital fissure of the chest wall. [thoraco- + G. schisis, fissure]

thoracoscope (tho-rak′o-skop)
An endoscope for viewing intrathoracic structures; may be video-assisted. [thoraco- + G. skopeo, to view]

thoracoscopy (thor-a-kos′ko-pe)
Examination of the pleural cavity with an endoscope. SYN: pleuroscopy. [thoraco- + G. skopeo, to view]

thoracostenosis (thor′a-ko-ste-no′sis)
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 sternum.

thoracostomy (thor-a-kos′to-me)
Establishment of an opening into the chest cavity, as for the drainage of an empyema. [thoraco- + G. stoma, mouth]

thoracotomy (thor-a-kot′o-me)
Incision through the chest wall into the pleural space. SYN: pleurotomy. [thoraco- + G. tome, incision] anterior t. anterior incision into the chest, usually submammary. axillary t. lateral t. placed below the axillary hairline; may be transverse or vertical. clamshell t. SYN: clamshell incision. minithoracotomy any t. involving less muscle division than the classic posterolateral t.. [colloquial] muscle-sparing t. any type of t. that does not involve significant division of the latissimus dorsi (muscle) and the serratus anterior (muscle). posterolateral t. t., involving division of the latissimus dorsi (muscle) and the serratus anterior (muscle).

thoradelphus (thor-a-del′fus)
Duplicitas posterior in which the individual is duplicated from the navel downward. See conjoined twins, under twin. SYN: thoracodelphus. [thoraco- + G. adelphos, brother]

thorax, gen. thoracis, pl .thoraces (tho′raks, tho′ra-sis, -ra′sez) [TA]
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 these; below, it is separated from the abdomen by the diaphragm; it contains the chief organs of the circulatory and respiratory systems. [L. fr. G. t., breastplate, the chest, fr. thoresso, to arm] barrel-shaped t. increased anteroposterior dimension of the t., so that lateral and anteroposterior dimensions are about equal, due to hyperinflation of the lungs. Seen in patients with emphysema. Peyrot t. an obliquely oval deformity of the chest in cases of a very large pleural effusion.

thorium (Th) (thor′e-um)
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 electron microscopy as a stain for acid mucopolysaccharides. [Thor, Norse god of thunder]

Thormählen
Johann, 19th century German physician. See T. test.

Thorn
George W., U.S. physician, *1906. See T. test, T. syndrome.

thorn (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 being broadcast from one's head to the external world where other people can hear them. t. insertion the delusion that one's thoughts are not really one's own but are being placed into one's mind by an external force. trend of t. thinking with a tendency toward or centering on a particular idea with a particular affect. t. withdrawal the delusion that one's thoughts have been removed from one's head resulting in a diminished number of thoughts remaining.

Thr
Symbol for threonine or its radical forms.

thread (thred)
1. A fine strand of suture material. 2. A filamentous structure. [M.E., fr. A.S. thraed] terminal t. SYN: terminal filum.




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