| thermometer | (noun) measuring instrument for measuring temperature | - |
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| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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| thermometry | (noun) the measurement of temperature | - |
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| thermopile | (noun) a kind of thermometer for measuring heat radiation; consists of several thermocouple junctions in series | - |
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| thermoplastic | (noun) a material that softens when heated and hardens again when cooled | Synonyms: thermoplastic resin |
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| thermoreceptor | (noun) a sensory receptor that responds to heat and cold | - |
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| thermoregulator | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermostat |
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| thermos | (noun) vacuum flask that preserves temperature of hot or cold drinks | Synonyms: thermos bottle, thermos flask |
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| thermosphere | (noun) the atmospheric layer between the mesosphere and the exosphere | - |
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| thermostat | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermoregulator |
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| thermostatics | (noun) the aspect of thermodynamics concerned with thermal equilibrium | Synonyms: thermodynamics of equilibrium |
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| thermotherapy | (noun) the use of heat to treat a disease or disorder; heating pads or hot compresses or hot-water bottles are used to promote circulation in peripheral vascular disease or to relax tense muscles | - |
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| thermotropism | (noun) an orienting response to warmth | - |
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| theropod | (noun) any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs | Synonyms: bird-footed dinosaur, theropod dinosaur |
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| thesaurus | (noun) a book containing a classified list of synonyms | Synonyms: synonym finder |
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| thesis | (noun) an unproved statement put forward as a premise in an argument | - |
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| (noun) a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree | Synonyms: dissertation |
| thespian | (noun) a theatrical performer | Synonyms: actor, histrion, player, role player |
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| theta | (noun) the 8th letter of the Greek alphabet | - |
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| theurgy | (noun) white magic performed with the help of beneficent spirits (as formerly practiced by Neoplatonists) | - |
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| (noun) the effect of supernatural or divine intervention in human affairs | - |
| thiabendazole | (noun) an antifungal agent and anthelmintic | - |
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| thiamin | (noun) a B vitamin that prevents beriberi; maintains appetite and growth | Synonyms: aneurin, antiberiberi factor, thiamine, vitamin B1 |
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| thiamine | (noun) a B vitamin that prevents beriberi; maintains appetite and growth | Synonyms: aneurin, antiberiberi factor, thiamin, vitamin B1 |
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| thiazide | (noun) any of a group of drugs commonly used as diuretics in the treatment of hypertension; they block the reabsorption of sodium in the kidneys | - |
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| thiazine | (noun) a compound made up of a ring of four carbon atoms and one sulfur atom and one nitrogen atom | - |
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| thick | (noun) the location of something surrounded by other things | Synonyms: midst |
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| thickener | (noun) any material used to thicken | Synonyms: thickening |
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| thickening | (noun) the act of thickening | Synonyms: inspissation |
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| (noun) any thickened enlargement | Synonyms: knob, node |
| (noun) any material used to thicken | Synonyms: thickener |
| thicket | (noun) a dense growth of bushes | Synonyms: brush, brushwood, coppice, copse |
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| thickhead | (noun) Australian and southeastern Asian birds with a melodious whistling call | Synonyms: whistler |
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| thickness | (noun) the dimension through an object as opposed to its length or width | - |
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| (noun) resistance to flow | - |
| (noun) used of a line or mark | Synonyms: heaviness |
| (noun) indistinct articulation | - |
| thief | (noun) a criminal who takes property belonging to someone else with the intention of keeping it or selling it | Synonyms: stealer |
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| thievery | (noun) the act of taking something from someone unlawfully | Synonyms: larceny, stealing, theft, thieving |
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| thieving | (noun) the act of taking something from someone unlawfully | Synonyms: larceny, stealing, theft, thievery |
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| thievishness | (noun) having a disposition to steal | Synonyms: larcenous |
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| thigh | (noun) the part of the leg between the hip and the knee | - |
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| (noun) the upper joint of the leg of a fowl | Synonyms: second joint |
| thighbone | (noun) the longest and thickest bone of the human skeleton; extends from the pelvis to the knee | Synonyms: femoris, femur |
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| thill | (noun) one of two shafts extending from the body of a cart or carriage on either side of the animal that pulls it | - |
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| thimble | (noun) a small metal cap to protect the finger while sewing; can be used as a small container | - |
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| (noun) as much as a thimble will hold | Synonyms: thimbleful |
| thimbleberry | (noun) raspberry native to eastern North America having black thimble-shaped fruit | Synonyms: black raspberry, blackcap, blackcap raspberry, Rubus occidentalis |
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| (noun) white-flowered raspberry of western North America and northern Mexico with thimble-shaped orange berries | Synonyms: Rubus parviflorus, salmon berry, salmonberry |
| (noun) shrubby raspberry of eastern North America having showy rose to purplish flowers and red or orange thimble-shaped fruit | Synonyms: flowering raspberry, purple-flowering raspberry, Rubus odoratus |
| thimbleful | (noun) as much as a thimble will hold | Synonyms: thimble |
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| thimblerig | (noun) a swindling sleight-of-hand game; victim guesses which of three things a pellet is under | Synonyms: shell game |
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| thimbleweed | (noun) a common North American anemone with cylindrical fruit clusters resembling thimbles | Synonyms: Anemone cylindrica |
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| thimerosal | (noun) a light-colored crystalline powder (trade name Merthiolate) used as a surgical antiseptic | Synonyms: Merthiolate, sodium ethylmercurithiosalicylate |
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| thing | (noun) a separate and self-contained entity | - |
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| (noun) an action | - |
| (noun) an artifact | - |
| (noun) an entity that is not named specifically | - |
| (noun) any attribute or quality considered as having its own existence | - |
| (noun) a special abstraction | - |
| (noun) a special objective | - |
| (noun) a vaguely specified concern | Synonyms: affair, matter |
| (noun) a statement regarded as an object | - |
| (noun) an event | - |
| (noun) a persistent illogical feeling of desire or aversion | - |
| (noun) a special situation | - |
| thingamabob | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget |
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| thingamajig | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget |
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| thingmabob | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget |
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| thingmajig | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget |
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| things | (noun) any movable possession (especially articles of clothing) | - |
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| thingumabob | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget |
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| thingumajig | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingummy, whatchamacallit, whatchamacallum, whatsis, widget |
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| thingummy | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, whatchamacallit, whatchamacallum, whatsis, widget |
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| think | (noun) an instance of deliberate thinking | - |
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| thinker | (noun) an important intellectual | Synonyms: creative thinker, mind |
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| (noun) someone who exercises the mind (usually in an effort to reach a decision) | - |
| 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 |