| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| dietetic | (adjective) of or relating to the diet | Synonyms: dietary, dietetical |
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| dietetical | (adjective) of or relating to the diet | Synonyms: dietary, dietetic |
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| dietetics | (noun) the scientific study of food preparation and intake | - |
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| glutethimide | (noun) sedative (trade name Doriden) used to treat some sleep disorders | Synonyms: Doriden |
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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| ketotetrose | (noun) A monosaccharide that has both a ketone and four carbons. | - |
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| lutetium | (noun) a trivalent metallic element of the rare earth group; usually occurs in association with yttrium | Synonyms: atomic number 71, Lu, lutecium |
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| motet | (noun) an unaccompanied choral composition with sacred lyrics; intended to be sung as part of a church service; originated in the 13th century | - |
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| obstetric | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetrical |
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| obstetrical | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetric |
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| obstetrician | (noun) a physician specializing in obstetrics | Synonyms: accoucheur |
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| obstetrics | (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: midwifery, OB, tocology |
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| octet | (noun) a musical composition written for eight performers | Synonyms: octette |
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| (noun) eight people considered as a unit | Synonyms: eightsome, octette |
| (noun) a set of eight similar things considered as a unit | Synonyms: octette |
| (noun) eight performers or singers who perform together | Synonyms: octette |
| (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octonary, ogdoad, VIII |
| octette | (noun) a musical composition written for eight performers | Synonyms: octet |
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| (noun) eight people considered as a unit | Synonyms: eightsome, octet |
| (noun) a set of eight similar things considered as a unit | Synonyms: octet |
| (noun) eight performers or singers who perform together | Synonyms: octet |
| oxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: hydroxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| pentylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentamethylenetetrazol |
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| peripatetic | (adjective) of or relating to Aristotle or his philosophy | Synonyms: Aristotelean, Aristotelian, Aristotelic |
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| (adjective) traveling especially on foot | Synonyms: wayfaring |
| (noun) a person who walks from place to place | - |
| peripateticism | (noun) (philosophy) the philosophy of Aristotle that deals with logic and metaphysics and ethics and poetics and politics and natural science | Synonyms: Aristotelianism |
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| polytetrafluoroethylene | (noun) a material used to coat cooking utensils and in industrial applications where sticking is to be avoided | Synonyms: Teflon |
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| quartet | (noun) a musical composition for four performers | Synonyms: quartette |
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| (noun) four people considered as a unit | Synonyms: foursome, quartette |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quadruplet, quartette |
| (noun) four performers or singers who perform together | Synonyms: quartette |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quatern, quaternary, quaternion, quaternity, tetrad |
| quartette | (noun) a musical composition for four performers | Synonyms: quartet |
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| (noun) four people considered as a unit | Synonyms: foursome, quartet |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quadruplet, quartet |
| (noun) four performers or singers who perform together | Synonyms: quartet |
| quintet | (noun) a musical composition for five performers | Synonyms: quintette |
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| (noun) five people considered as a unit | Synonyms: fivesome, quintette |
| (noun) a set of five similar things considered as a unit | Synonyms: quintette, quintuple, quintuplet |
| (noun) five performers or singers who perform together | Synonyms: quintette |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintuplet, V |
| quintette | (noun) a musical composition for five performers | Synonyms: quintet |
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| (noun) five people considered as a unit | Synonyms: fivesome, quintet |
| (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintuple, quintuplet |
| (noun) five performers or singers who perform together | Synonyms: quintet |
| septet | (noun) a musical composition written for seven performers | Synonyms: septette |
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| (noun) seven people considered as a unit | Synonyms: septette, sevensome |
| (noun) a set of seven similar things considered as a unit | Synonyms: septette |
| (noun) seven performers or singers who perform together | Synonyms: septette |
| (noun) the cardinal number that is the sum of six and one | Synonyms: 7, heptad, septenary, seven, sevener, VII |
| septette | (noun) a musical composition written for seven performers | Synonyms: septet |
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| (noun) seven people considered as a unit | Synonyms: septet, sevensome |
| (noun) a set of seven similar things considered as a unit | Synonyms: septet |
| (noun) seven performers or singers who perform together | Synonyms: septet |
| sestet | (noun) a musical composition written for six performers | Synonyms: sextet, sextette |
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| (noun) a rhythmic group of six lines of verse | - |
| (noun) a set of six similar things considered as a unit | Synonyms: sextet, sextette |
| (noun) six performers or singers who perform together | Synonyms: sextet, sextette |
| (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, hexad, sextet, sextuplet, sise, six, sixer, VI |
| sextet | (noun) a musical composition written for six performers | Synonyms: sestet, sextette |
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| (noun) six people considered as a unit | Synonyms: sextette, sixsome |
| (noun) a set of six similar things considered as a unit | Synonyms: sestet, sextette |
| (noun) six performers or singers who perform together | Synonyms: sestet, sextette |
| (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, hexad, sestet, sextuplet, sise, six, sixer, VI |
| sextette | (noun) a musical composition written for six performers | Synonyms: sestet, sextet |
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| (noun) six people considered as a unit | Synonyms: sextet, sixsome |
| (noun) a set of six similar things considered as a unit | Synonyms: sestet, sextet |
| (noun) six performers or singers who perform together | Synonyms: sestet, sextet |
| stet | (verb) direct that a matter marked for omission or correction is to be retained | - |
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| (verb) cancel, as of a correction or deletion | - |
| stethoscope | (noun) a medical instrument for listening to the sounds generated inside the body | - |
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| 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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| untethered | (adjective) not confined or restricted with a tether | - |
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| whitetail | (noun) common North American deer; tail has a white underside | Synonyms: Odocoileus Virginianus, Virginia deer, white-tailed deer, white tail, whitetail deer |
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| whitethorn | (noun) thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America | Synonyms: Crataegus laevigata, Crataegus oxycantha, English hawthorn, may |
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| whitethroat | (noun) common North American finch with a white patch on the throat and black-and-white striped crown | Synonyms: white-throated sparrow, Zonotrichia albicollis |
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| (noun) greyish-brown Old World warbler with a white throat and underparts | Synonyms: greater whitethroat, Sylvia communis |
| (noun) Old World warbler similar to the greater whitethroat but smaller | Synonyms: lesser whitethroat, Sylvia curruca |