| tetanic | (adjective) of or relating to or causing tetanus | - |
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| (adjective) of or relating to or causing tetany | - |
| tetanilla | (noun) clinical neurological syndrome characterized by muscular twitching and cramps and (when severe) seizures; associated with calcium deficiency (hypoparathyroidism) or vitamin D deficiency or alkalosis | Synonyms: apyretic tetanus, intermittent cramp, intermittent tetanus, tetany |
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| tetanus | (noun) a sustained muscular contraction resulting from a rapid series of nerve impulses | - |
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| (noun) an acute and serious infection of the central nervous system caused by bacterial infection of open wounds; spasms of the jaw and laryngeal muscles may occur during the late stages | Synonyms: lockjaw |
| tetany | (noun) clinical neurological syndrome characterized by muscular twitching and cramps and (when severe) seizures; associated with calcium deficiency (hypoparathyroidism) or vitamin D deficiency or alkalosis | Synonyms: apyretic tetanus, intermittent cramp, intermittent tetanus, tetanilla |
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| tetartanopia | (noun) a form of dichromacy characterized by lowered sensitivity to yellow light; so rare that its existence has been questioned | Synonyms: yellow-blindness |
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| tetchily | (adverb) in an ill-natured and tetchy manner | - |
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| tetchiness | (noun) feeling easily irritated | Synonyms: testiness, touchiness |
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| tetchy | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, irritable, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy |
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| teth | (noun) the 9th letter of the Hebrew alphabet | - |
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| tether | (noun) restraint consisting of a rope (or light chain) used to restrain an animal | Synonyms: lead, leash |
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| (verb) tie with a tether | - |
| tetherball | (noun) a game with two players who use rackets to strike a ball that is tethered to the top of a pole; the object is to wrap the string around the pole | - |
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| tethered | (adjective) confined or restricted with or as if with a rope or chain | - |
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| tetra | (noun) brightly colored tropical freshwater fishes | - |
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| tetracaine | (noun) a crystalline compound used in the form of a hydrochloride as a local anesthetic | - |
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| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloride | (noun) any compound that contains four chlorine atoms per molecule | - |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| tetracycline | (noun) an antibiotic (trade name Achromycin) derived from microorganisms of the genus Streptomyces and used broadly to treat infections | Synonyms: Achromycin |
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| tetrad | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity |
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| tetrafluoroethylene | (noun) a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins) | - |
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| tetragen | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, crystallogen, Group 14 element, tetrel |
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| tetragon | (noun) a four-sided polygon | Synonyms: quadrangle, quadrilateral |
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| tetragonal | (adjective) of or relating to or shaped like a quadrilateral | - |
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| tetragram | (noun) a word that is written with four letters in an alphabetic writing system | - |
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| tetrahalide | (noun) any halide containing four halogen atoms in its molecules | - |
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| tetrahedron | (noun) any polyhedron having four plane faces | - |
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| tetrahydrocannabinol | (noun) psychoactive substance present in marijuana | Synonyms: THC |
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| tetrahymena | (noun) relative of the paramecium; often used in genetics research | - |
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| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| tetralogy | (noun) a series of four related works (plays or operas or novels) | - |
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| tetramerous | (adjective) having or consisting of four similar parts; tetramerous flowers | - |
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| tetrameter | (noun) a verse line having four metrical feet | - |
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| tetramethyldiarsine | (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: cacodyl |
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| tetrametric | (adjective) of or relating to verse lines written in tetrameter | - |
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| tetranychid | (noun) web-spinning mite that attacks garden plants and fruit trees | Synonyms: spider mite |
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| tetrapod | (noun) a vertebrate animal having four feet or legs or leglike appendages | - |
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| tetrasaccharide | (noun) any of a variety of carbohydrates that yield four monosaccharide molecules on complete hydrolysis | - |
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| tetraskele | (noun) a figure consisting of four stylized human arms or legs (or bent lines) radiating from a center | Synonyms: tetraskelion |
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| tetraskelion | (noun) a figure consisting of four stylized human arms or legs (or bent lines) radiating from a center | Synonyms: tetraskele |
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| tetrasporangium | (noun) a sporangium containing four asexual spores | - |
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| tetraspore | (noun) one of the four asexual spores produced within a sporangium | - |
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| tetravalent | (adjective) having a valence of four | - |
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| tetrel | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, crystallogen, Group 14 element, tetragen |
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| tetri | (noun) 100 tetri equal 1 lari in Georgia | - |
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| tetrode | (noun) a thermionic tube having four electrodes | - |
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| tetrodotoxin | (noun) a powerful neurotoxin found in the ovaries of pufferfish | - |
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| tetrose | (noun) any monosaccharide sugar containing four atoms of carbon per molecule | - |
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| tetroxide | (noun) an oxide containing four atoms of oxygen in the molecule | - |
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| tetryl | (noun) a yellow crystalline explosive solid that is used in detonators | Synonyms: nitramine |
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| tetterwort | (noun) perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant | Synonyms: bloodroot, puccoon, redroot, Sanguinaria canadensis |
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| tettigoniid | (noun) grasshoppers with long threadlike antennae and well-developed stridulating organs on the forewings of the male | Synonyms: long-horned grasshopper |
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