| thinking | (noun) the process of using your mind to consider something carefully | Synonyms: cerebration, intellection, mentation, thought, thought process |
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| thinner | (noun) a diluting agent | Synonyms: diluent, dilutant |
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| thinness | (noun) the property of having little body fat | Synonyms: leanness, spareness |
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| (noun) relatively small dimension through an object as opposed to its length or width | Synonyms: slenderness, tenuity |
| (noun) a consistency of low viscosity | - |
| (noun) the property of being very narrow or thin | Synonyms: fineness |
| (noun) the property of being scanty or scattered; lacking denseness | Synonyms: spareness, sparseness, sparsity |
| (noun) The property of lacking substance or strength. | - |
| thinning | (noun) the act of diluting something | Synonyms: cutting |
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| thiobacillus | (noun) small rod-shaped bacteria living in sewage or soil and oxidizing sulfur | - |
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| thiobacteria | (noun) any bacterium of the genus Thiobacillus | Synonyms: sulfur bacteria, sulphur bacteria |
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| thiocyanate | (noun) a salt of thiocyanic acid; formed when alkaline cyanides are fused with sulfur | - |
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| thiodiphenylamine | (noun) a compound used primarily in veterinary medicine to rid farm animals of internal parasites | Synonyms: phenothiazine |
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| thioguanine | (noun) an antineoplastic drug used to treat acute leukemias | - |
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| thiopental | (noun) barbiturate that is a hygroscopic powder (trade name Pentothal) that is a strong barbiturate that acts rapidly; induces a relaxed state when injected as a general anesthetic | Synonyms: Pentothal, thiopental sodium, thiopentobarbital sodium |
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| thioridazine | (noun) a tranquilizer (trade name Mellaril) used to treat schizophrenia and other psychotic disorders | Synonyms: Mellaril |
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| thiotepa | (noun) an antineoplastic drug used to treat certain malignancies | - |
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| thiothixene | (noun) a tranquilizer (trade name Navane) used to treat schizophrenia | Synonyms: Navane |
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| thiouracil | (noun) depresses the function of the thyroid gland | - |
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| third | (noun) the fielding position of the player on a baseball team who is stationed near the third of the bases in the infield (counting counterclockwise from home plate) | Synonyms: third base |
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| (noun) the third from the lowest forward ratio gear in the gear box of a motor vehicle | Synonyms: third gear |
| (noun) the base that must be touched third by a base runner in baseball | Synonyms: third base |
| (noun) the musical interval between one note and another three notes away from it | - |
| (noun) one of three equal parts of a divisible whole | Synonyms: one-third, tierce |
| (noun) following the second position in an ordering or series | - |
| thirst | (noun) strong desire for something (not food or drink) | Synonyms: hunger, hungriness, thirstiness |
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| (noun) a physiological need to drink | Synonyms: thirstiness |
| thirster | (noun) a person with a strong desire for something | Synonyms: longer, yearner |
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| thirstiness | (noun) strong desire for something (not food or drink) | Synonyms: hunger, hungriness, thirst |
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| (noun) a physiological need to drink | Synonyms: thirst |
| (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridity, aridness |
| thirteen | (noun) the cardinal number that is the sum of twelve and one | Synonyms: 13, baker's dozen, long dozen, XIII |
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| thirteenth | (noun) position 13 in a countable series of things | - |
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| thirties | (noun) the time of life between 30 and 40 | Synonyms: mid-thirties, thirty-something |
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| (noun) the decade from 1930 to 1939 | Synonyms: 1930s |
| thirtieth | (noun) position 30 in a countable series of things | - |
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| thirty | (noun) the cardinal number that is the product of ten and three | Synonyms: 30, XXX |
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| thistle | (noun) any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves | - |
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| thistledown | (noun) pappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistle | - |
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| thole | (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: oarlock, peg, pin, rowlock, tholepin |
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| tholepin | (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: oarlock, peg, pin, rowlock, thole |
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| thong | (noun) leather strip that forms the flexible part of a whip | Synonyms: lash |
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| (noun) a thin strip of leather; often used to lash things together | - |
| (noun) a backless sandal held to the foot by a thong between the big toe and the second toe | Synonyms: flip-flop |
| (noun) minimal clothing worn by stripteasers; a narrow strip of fabric that covers the pubic area, passes between the thighs, and is supported by a waistband | Synonyms: G-string |
| (noun) underpants resembling a G-string; worn by women especially under very tight pants | - |
| thoracentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracocentesis |
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| thoracocentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracentesis |
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| thoracotomy | (noun) surgical incision into the chest walls opening up the pleural cavity | - |
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| thorax | (noun) part of an insect's body that bears the wings and legs | - |
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| (noun) the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates | Synonyms: chest, pectus |
| (noun) the middle region of the body of an arthropod between the head and the abdomen | - |
| thorite | (noun) a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite | - |
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| thorium | (noun) a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands | Synonyms: atomic number 90, Th |
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| thorn | (noun) something that causes irritation and annoyance | Synonyms: irritant |
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| (noun) a Germanic character of runic origin | - |
| (noun) a small sharp-pointed tip resembling a spike on a stem or leaf | Synonyms: pricker, prickle, spikelet, spine, sticker |
| thornbill | (noun) any of various South American hummingbirds with a sharp pointed bill | - |
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| thorniness | (noun) the quality of being covered with prickly thorns or spines | Synonyms: bristliness, prickliness, spininess |
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| (noun) a rough and bitter manner | Synonyms: acerbity, acrimony, bitterness, jaundice, tartness |
| (noun) The property of being full of difficulties, complexities, or controversial points. | - |
| thoroughbred | (noun) a pedigreed animal of unmixed lineage; used especially of horses | Synonyms: pureblood, purebred |
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| (noun) a racehorse belonging to a breed that originated from a cross between Arabian stallions and English mares | - |
| (noun) a well-bred person | - |
| thoroughfare | (noun) a public road from one place to another | - |
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| thoroughness | (noun) conscientiousness in performing all aspects of a task | - |
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| (noun) property of being marked by full detail, complete in all respects. | - |
| thoroughwort | (noun) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine | Synonyms: agueweed, boneset, Eupatorium perfoliatum |
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| thortveitite | (noun) a mineral consisting of scandium yttrium silicate; a source of scandium | - |
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| thou | (noun) the cardinal number that is the product of 10 and 100 | Synonyms: 1000, chiliad, G, grand, K, M, one thousand, thousand, yard |
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| thought | (noun) the process of using your mind to consider something carefully | Synonyms: cerebration, intellection, mentation, thinking, thought process |
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| (noun) the content of cognition; the main thing you are thinking about | Synonyms: idea |
| (noun) the organized beliefs of a period or group or individual | - |
| (noun) a personal belief or judgment that is not founded on proof or certainty | Synonyms: opinion, persuasion, sentiment, view |
| thoughtfulness | (noun) a considerate and thoughtful act | Synonyms: consideration |
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| (noun) the trait of thinking carefully before acting | - |
| (noun) kind and considerate regard for others | Synonyms: considerateness, consideration |
| (noun) a calm, lengthy, intent consideration | Synonyms: contemplation, musing, reflection, reflexion, rumination |
| thoughtlessness | (noun) the trait of not thinking carefully before acting | Synonyms: unthoughtfulness |
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| (noun) the quality of failing to be considerate of others | Synonyms: inconsiderateness, inconsideration |
| thousand | (noun) the cardinal number that is the product of 10 and 100 | Synonyms: 1000, chiliad, G, grand, K, M, one thousand, thou, yard |
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| thousandth | (noun) one part in a thousand equal parts | Synonyms: one-thousandth |
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| (noun) position 1,000 in a countable series of things | - |
| thraldom | (noun) the state of being under the control of another person | Synonyms: bondage, slavery, thrall, thralldom |
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| thrall | (noun) someone held in bondage | - |
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| (noun) the state of being under the control of another person | Synonyms: bondage, slavery, thraldom, thralldom |
| thralldom | (noun) the state of being under the control of another person | Synonyms: bondage, slavery, thraldom, thrall |
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| thrash | (noun) a swimming kick used while treading water | - |
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| thrasher | (noun) thrush-like American songbird able to mimic other birdsongs | Synonyms: mocking thrush |
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| (noun) large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed | Synonyms: Alopius vulpinus, fox shark, thresher, thresher shark |
| (noun) a farm machine for separating seeds or grain from the husks and straw | Synonyms: thresher, threshing machine |
| thrashing | (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: beating, drubbing, lacing, licking, trouncing, whacking |
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| (noun) a sound defeat | Synonyms: debacle, drubbing, slaughter, trouncing, walloping, whipping |
| thread | (noun) a fine cord of twisted fibers (of cotton or silk or wool or nylon etc.) used in sewing and weaving | Synonyms: yarn |
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| (noun) the raised helical rib going around a screw | Synonyms: screw thread |
| (noun) the connections that link the various parts of an event or argument together | Synonyms: train of thought |
| (noun) any long object resembling a thin line | Synonyms: ribbon |
| threader | (noun) a blunt needle for threading ribbon through loops | Synonyms: bodkin |
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| threadfin | (noun) mullet-like tropical marine fishes having pectoral fins with long threadlike rays | - |
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| threadfish | (noun) fish having greatly elongated front rays on dorsal and anal fins | Synonyms: Alectis ciliaris, thread-fish |
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| threadiness | (noun) The state or quality of consisting of or bearing fibers or filaments. | - |
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| threads | (noun) informal terms for clothing | Synonyms: duds, togs |
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| threadworm | (noun) small threadlike worm infesting human intestines and rectum especially in children | Synonyms: Enterobius vermicularis, pinworm |
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| threat | (noun) a warning that something unpleasant is imminent | - |
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| (noun) declaration of an intention or a determination to inflict harm on another | - |
| (noun) a person who inspires fear or dread | Synonyms: scourge, terror |
| (noun) something that is a source of danger | Synonyms: menace |
| three | (noun) one of four playing cards in a deck having three pips | Synonyms: trey |
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| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, threesome, tierce, trey, triad, trine, trinity, trio, triplet, troika |
| threepence | (noun) former cupronickel coin of the United Kingdom equal to three pennies | - |
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| threescore | (noun) a set with 3 times 20 members | - |
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| threesome | (noun) three people considered as a unit | Synonyms: triad, trinity, trio |
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| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, tierce, trey, triad, trine, trinity, trio, triplet, troika |
| threnody | (noun) a song or hymn of mourning composed or performed as a memorial to a dead person | Synonyms: coronach, dirge, lament, requiem |
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| threonine | (noun) a colorless crystalline amino acid found in protein; occurs in the hydrolysates of certain proteins; an essential component of human nutrition | - |
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| thresher | (noun) large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed | Synonyms: Alopius vulpinus, fox shark, thrasher, thresher shark |
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| (noun) a farm machine for separating seeds or grain from the husks and straw | Synonyms: thrasher, threshing machine |
| threshing | (noun) the separation of grain or seeds from the husks and straw | - |
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| threshold | (noun) the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway | Synonyms: doorsill, doorstep |
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| (noun) the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close | Synonyms: door, doorway, room access |
| (noun) the smallest detectable sensation | Synonyms: limen |
| (noun) a region marking a boundary | Synonyms: brink, verge |
| (noun) the starting point for a new state or experience | - |
| thrift | (noun) extreme care in spending money; reluctance to spend money unnecessarily | Synonyms: parsimoniousness, parsimony, penny-pinching |
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| (noun) any of numerous sun-loving low-growing evergreens of the genus Armeria having round heads of pink or white flowers | - |
| thriftiness | (noun) frugality in the expenditure of money or resources | Synonyms: economy |
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| thriftlessness | (noun) the trait of wasting resources | Synonyms: waste, wastefulness |
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| thriftshop | (noun) a shop that sells secondhand goods at reduced prices | Synonyms: second-hand store |
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| thrill | (noun) something that causes you to experience a sudden intense feeling or sensation | - |
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| (noun) the swift release of a store of affective force | Synonyms: bang, boot, charge, flush, kick, rush |
| (noun) an almost pleasurable sensation of fright | Synonyms: chill, frisson, quiver, shiver, shudder, tingle |
| thriller | (noun) a suspenseful adventure story or play or movie | - |
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| thrip | (noun) any of various small to minute sucking insects with narrow feathery wings if any; they feed on plant sap and many are destructive | Synonyms: thripid, thrips |
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| thripid | (noun) any of various small to minute sucking insects with narrow feathery wings if any; they feed on plant sap and many are destructive | Synonyms: thrip, thrips |
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| thrips | (noun) any of various small to minute sucking insects with narrow feathery wings if any; they feed on plant sap and many are destructive | Synonyms: thrip, thripid |
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| throat | (noun) the part of an animal's body that corresponds to a person's throat | - |
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| (noun) a passage resembling a throat in shape or function | - |
| (noun) an opening in the vamp of a shoe at the instep | - |
| (noun) the passage to the stomach and lungs; in the front part of the neck below the chin and above the collarbone | Synonyms: pharynx |
| throatwort | (noun) European bellflower with blue-purple to lilac flowers formerly used to treat sore throat | Synonyms: Campanula trachelium, nettle-leaved bellflower |
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| throb | (noun) an instance of rapid strong pulsation (of the heart) | Synonyms: pounding, throbbing |
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| (noun) a deep pulsating type of pain | - |
| throbbing | (noun) an instance of rapid strong pulsation (of the heart) | Synonyms: pounding, throb |
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| (noun) a sound with a strong rhythmic beat | - |
| throe | (noun) severe spasm of pain | - |
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| (noun) hard or painful trouble or struggle | - |
| throes | (noun) violent pangs of suffering | - |
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| thrombasthenia | (noun) a rare autosomal recessive disease in which the platelets do not produce clots in the normal way and hemorrhage results | - |
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| thrombectomy | (noun) surgical removal of a blood clot (thrombus) from a blood vessel | - |
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| thrombin | (noun) an enzyme that acts on fibrinogen in blood causing it to clot | - |
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| thrombocyte | (noun) tiny bits of protoplasm found in vertebrate blood; essential for blood clotting | Synonyms: blood platelet, platelet |
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| thrombocytopenia | (noun) a blood disease characterized by an abnormally small number of platelets in the blood | Synonyms: thrombopenia |
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| thrombocytosis | (noun) increase in the number of platelets in the blood which tends to cause clots to form; associated with many neoplasms and chronic infections and other diseases | - |
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| thromboembolism | (noun) occlusion of a blood vessel by an embolus that has broken away from a thrombus | - |
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| thrombokinase | (noun) an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot | Synonyms: factor III, thromboplastin |
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| thrombolysis | (noun) the process of breaking up and dissolving blood clots | - |
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| thrombolytic | (noun) a kind of pharmaceutical that can break up clots blocking the flow of blood to the heart muscle | Synonyms: clot buster, thrombolytic agent |
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| thrombopenia | (noun) a blood disease characterized by an abnormally small number of platelets in the blood | Synonyms: thrombocytopenia |
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| thrombophlebitis | (noun) phlebitis in conjunction with the formation of a blood clot (thrombus) | - |
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| thromboplastin | (noun) an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot | Synonyms: factor III, thrombokinase |
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| thrombosis | (noun) the formation or presence of a thrombus (a clot of coagulated blood attached at the site of its formation) in a blood vessel | - |
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