| thoracentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracocentesis |
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| thoracic | (adjective) of or relating to the chest or thorax | Synonyms: pectoral |
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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 | - |
| thoriate | (verb) impregnate with thorium oxide to increase thermionic emission | - |
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| thoriated | (adjective) being or sounding of nervous or suppressed laughter | Synonyms: tittering |
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| 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. | - |
| thornless | (adjective) lacking thorns | Synonyms: spineless |
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| thorny | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbed, barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setaceous, setose, spiny |
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| (adjective) bristling with perplexities | - |
| thorough | (adjective) painstakingly careful and accurate | - |
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| (adjective) performed comprehensively and completely; not superficial or partial | Synonyms: exhaustive, thoroughgoing |
| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thoroughgoing, unadulterated, utter |
| thoroughbred | (adjective) having a list of ancestors as proof of being a purebred animal | Synonyms: pedigree, pedigreed, pureblood, pureblooded |
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| (noun) a pedigreed animal of unmixed lineage; used especially of horses | Synonyms: pureblood, purebred |
| (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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| thoroughgoing | (adjective) performed comprehensively and completely; not superficial or partial | Synonyms: exhaustive, thorough |
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| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, unadulterated, utter |
| thoroughly | (adverb) in an exhaustive manner | Synonyms: exhaustively |
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| (adverb) completely and absolutely (`good' is sometimes used informally for `thoroughly') | Synonyms: good, soundly |
| 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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