| tomentum | (noun) a network of tiny blood vessels between the cerebral surface of the pia mater and the cerebral cortex | Synonyms: tomentum cerebri |
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| (noun) filamentous hairlike growth on a plant | Synonyms: fuzz, hair |
| tonometer | (noun) measuring instrument for measuring tension or pressure (especially for measuring intraocular pressure in testing for glaucoma) | - |
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| tonometry | (noun) the measurement of intraocular pressure by determining the amount of force needed to make a slight indentation in the cornea | - |
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| toothsomeness | (noun) extreme appetizingness | Synonyms: delectability, deliciousness, lusciousness |
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| tragicomedy | (noun) a dramatic composition involving elements of both tragedy and comedy usually with the tragic predominating | - |
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| (noun) a comedy with serious elements or overtones | Synonyms: seriocomedy |
| tribromomethane | (noun) colorless liquid haloform CHBr3 | Synonyms: bromoform |
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| trichloromethane | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: chloroform |
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| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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| trigonometrician | (noun) a mathematician specializing in trigonometry | - |
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| trigonometry | (noun) the mathematics of triangles and trigonometric functions | Synonyms: trig |
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| triiodomethane | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: iodoform |
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| troublesomeness | (noun) a difficulty that causes anxiety | Synonyms: inconvenience, worriment |
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| twosome | (noun) a pair who associate with one another | Synonyms: couple, duet, duo |
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| (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duet, duo, dyad, pair, span, twain, yoke |
| udometer | (noun) gauge consisting of an instrument to measure the quantity of precipitation | Synonyms: pluviometer, rain gage, rain gauge |
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| untroublesomeness | (noun) The property of not giving trouble or anxiety. | - |
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| unwholesomeness | (noun) the quality of being unhealthful and generally bad for you | Synonyms: morbidity, morbidness |
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| variometer | (noun) a measuring instrument for measuring variations in a magnetic field | - |
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| velodrome | (noun) a banked oval track for bicycle or motorcycle racing | - |
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| venturesomeness | (noun) the trait of being adventurous | Synonyms: adventurousness |
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| viscometer | (noun) a measuring instrument for measuring viscosity | Synonyms: viscosimeter |
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| viscometry | (noun) the measurement of viscosity | Synonyms: viscosimetry |
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| vomer | (noun) thin trapezoidal bone of the skull forming the posterior and inferior parts of the nasal septum | - |
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| welcome | (noun) a greeting or reception | - |
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| (noun) the state of being welcome | - |
| welcomer | (noun) a person who greets | Synonyms: greeter, saluter |
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| wholesomeness | (noun) the quality of being beneficial and generally good for you | - |
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| winsomeness | (noun) childlike charm or appeal | - |
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| xylometer | (noun) an instrument used to determine the specific gravity of wood | - |
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