| tetchiness | (noun) feeling easily irritated | Synonyms: testiness, touchiness |
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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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| 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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| 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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| 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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| 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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| 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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| 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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| text | (noun) the words of something written | Synonyms: textual matter |
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| (noun) the main body of a written work (as distinct from illustrations or footnotes etc.) | - |
| (noun) a book prepared for use in schools or colleges | Synonyms: school text, schoolbook, text edition, textbook |
| (noun) a passage from the Bible that is used as the subject of a sermon | - |
| textbook | (noun) a book prepared for use in schools or colleges | Synonyms: school text, schoolbook, text, text edition |
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| textile | (noun) artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers | Synonyms: cloth, fabric, material |
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| texting | (noun) the act of sending messages via SMS | - |
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| textolite | (noun) a laminated composite material used for electrotechnical components, inserts and bearings. | - |
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| texture | (noun) the feel of a surface or a fabric | - |
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| (noun) the characteristic appearance of a surface having a tactile quality | - |
| (noun) the musical pattern created by parts being played or sung together | - |
| (noun) the physical composition of something (especially with respect to the size and shape of the small constituents of a substance) | Synonyms: grain |
| (noun) the essential quality of something | - |
| thalamus | (noun) large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalon | - |
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| thalassaemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassemia |
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| thalassemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassaemia |
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| thalidomide | (noun) a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis | - |
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| thallium | (noun) a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores | Synonyms: atomic number 81, Tl |
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| thallophyte | (noun) any of a group of cryptogamic organisms consisting principally of a thallus and thus showing no differentiation into stem and root and leaf | - |
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| thallus | (noun) a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes | - |
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| thalmencephalon | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, diencephalon, interbrain |
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| thalweg | (noun) a line following the lowest points of a valley | - |
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| (noun) the middle of the chief navigable channel of a waterway that forms the boundary line between states | - |
| thanatology | (noun) the branch of science that studies death (especially its social and psychological aspects) | - |
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| thanatophobia | (noun) a morbid fear of death | - |
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| thanatopsis | (noun) an essay expressing a view on the subject of death | - |
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| thane | (noun) a man ranking above an ordinary freeman and below a noble in Anglo-Saxon England (especially one who gave military service in exchange for land) | - |
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| (noun) a feudal lord or baron | - |
| thaneship | (noun) the position of thane | - |
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| thankfulness | (noun) warm friendly feelings of gratitude | Synonyms: appreciativeness, gratefulness |
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| thanks | (noun) with the help of or owing to | - |
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| (noun) an acknowledgment of appreciation | - |
| thanksgiving | (noun) a short prayer of thanks before a meal | Synonyms: blessing, grace |
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| thatch | (noun) a house roof made with a plant material (as straw) | Synonyms: thatched roof |
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| (noun) hair resembling thatched roofing material | - |
| (noun) plant stalks used as roofing material | - |
| thatcher | (noun) someone skilled in making a roof from plant stalks or foliage | - |
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| thaumatolatry | (noun) the worship of miracles | Synonyms: miracle-worship |
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| thaumaturge | (noun) one who practices magic or sorcery | Synonyms: magician, necromancer, sorcerer, thaumaturgist, wizard |
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| thaumaturgist | (noun) one who practices magic or sorcery | Synonyms: magician, necromancer, sorcerer, thaumaturge, wizard |
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| thaumaturgy | (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, deception, illusion, legerdemain, magic, magic trick, trick |
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| (noun) any art that invokes supernatural powers | Synonyms: magic |
| thaw | (noun) a relaxation or slackening of tensions or reserve; becoming less hostile | - |
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| (noun) warm weather following a freeze; snow and ice melt | Synonyms: thawing, warming |
| (noun) the process whereby heat changes something from a solid to a liquid | Synonyms: melt, melting, thawing |
| thawing | (noun) warm weather following a freeze; snow and ice melt | Synonyms: thaw, warming |
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| (noun) the process whereby heat changes something from a solid to a liquid | Synonyms: melt, melting, thaw |
| theanthropism | (noun) (theology) the doctrine that Jesus was a union of the human and the divine | - |
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| (noun) the representation of objects (especially a god) as having human form or traits | Synonyms: anthropomorphism |
| theater | (noun) a building where theatrical performances or motion-picture shows can be presented | Synonyms: house, theatre |
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| (noun) the art of writing and producing plays | Synonyms: dramatic art, dramatics, dramaturgy, theatre |
| (noun) a region in which active military operations are in progress | Synonyms: field, field of operations, theater of operations, theatre, theatre of operations |
| theatergoer | (noun) someone who attends the theater | Synonyms: playgoer, theatregoer |
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| theatre | (noun) a building where theatrical performances or motion-picture shows can be presented | Synonyms: house, theater |
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| (noun) the art of writing and producing plays | Synonyms: dramatic art, dramatics, dramaturgy, theater |
| (noun) a region in which active military operations are in progress | Synonyms: field, field of operations, theater, theater of operations, theatre of operations |
| theatregoer | (noun) someone who attends the theater | Synonyms: playgoer, theatergoer |
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| theatrical | (noun) a performance of a play | Synonyms: histrionics, representation, theatrical performance |
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| theatricality | (noun) an artificial and mannered quality | Synonyms: staginess |
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| theatrology | (noun) the study of theatrical performance in relation to its literary, physical, psycho-biological, sociological, and historical contexts. | Synonyms: theatre studies |
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| thebe | (noun) 100 thebe equal 1 pula in Botswana | - |
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| theca | (noun) outer sheath of the pupa of certain insects | - |
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| (noun) a case or sheath especially a pollen sac or moss capsule | Synonyms: sac |
| thecodont | (noun) presumably in the common ancestral line to dinosaurs and crocodiles and birds | Synonyms: thecodont reptile |
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| theelin | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: estrone, Estronol, oestrone |
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| theft | (noun) the act of taking something from someone unlawfully | Synonyms: larceny, stealing, thievery, thieving |
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| theine | (noun) caffeine when present in tea. | - |
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| theism | (noun) the doctrine or belief in the existence of a God or gods | - |
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| theist | (noun) one who believes in the existence of a god or gods | - |
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| thelarche | (noun) the start of breast development in a woman at the beginning of puberty | - |
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| theme | (noun) a unifying idea that is a recurrent element in literary or artistic work | Synonyms: motif |
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| (noun) the subject matter of a conversation or discussion | Synonyms: subject, topic |
| (noun) an essay (especially one written as an assignment) | Synonyms: composition, paper, report |
| (noun) (music) melodic subject of a musical composition | Synonyms: idea, melodic theme, musical theme |
| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, radical, root, root word, stem |
| then | (noun) that time; that moment | - |
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| thenar | (noun) the inner surface of the hand from the wrist to the base of the fingers | Synonyms: palm |
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| (noun) the fleshy area of the palm at the base of the thumb | - |
| theocentrism | (noun) the belief that God is the central aspect to our existence. | - |
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| theocracy | (noun) the belief in government by divine guidance | - |
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| (noun) a political unit governed by a deity (or by officials thought to be divinely guided) | - |
| theodicy | (noun) the branch of theology that defends God's goodness and justice in the face of the existence of evil | - |
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| theodolite | (noun) a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod | Synonyms: transit |
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| theogony | (noun) the study of the origins and genealogy of the gods | - |
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| theologian | (noun) someone who is learned in theology or who speculates about theology | Synonyms: theologiser, theologist, theologizer |
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| theologiser | (noun) someone who is learned in theology or who speculates about theology | Synonyms: theologian, theologist, theologizer |
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| theologist | (noun) someone who is learned in theology or who speculates about theology | Synonyms: theologian, theologiser, theologizer |
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| theologizer | (noun) someone who is learned in theology or who speculates about theology | Synonyms: theologian, theologiser, theologist |
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