| thumb | (noun) the part of a glove that provides a covering for the thumb | - |
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| (noun) a convex molding having a cross section in the form of a quarter of a circle or of an ellipse | Synonyms: ovolo, quarter round |
| (noun) the thick short innermost digit of the forelimb | Synonyms: pollex |
| thumbhole | (noun) a finger hole made to fit the thumb (as in a bowling ball) | - |
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| (noun) the hole in a woodwind that is closed and opened with the thumb | - |
| thumbnail | (noun) the nail of the thumb | - |
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| thumbnut | (noun) a threaded nut with winglike projections for thumb and forefinger leverage in turning | Synonyms: butterfly nut, wing-nut, wing nut, wing screw |
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| thumbprint | (noun) fingerprint made by the thumb (especially by the pad of the thumb) | - |
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| thumbscrew | (noun) screw designed to be turned with the thumb and fingers | - |
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| (noun) instrument of torture that crushes the thumb | - |
| thumbstall | (noun) protective covering for an injured thumb | - |
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| thumbtack | (noun) a tack for attaching papers to a bulletin board or drawing board | Synonyms: drawing pin, pushpin |
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| thump | (noun) a heavy blow with the hand | - |
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| (noun) a heavy dull sound (as made by impact of heavy objects) | Synonyms: clump, clunk, thud, thumping |
| thumping | (noun) a heavy dull sound (as made by impact of heavy objects) | Synonyms: clump, clunk, thud, thump |
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