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trapezium |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Trapezium \Tra*pe"zi*um\, n.; pl E. {Trapeziums}, L. {Trapezia}. [NL., fr Gr ? a little table, an irregular four-sided figure, dim. of ? a table, for ?; ? (see {Tetra-}) + ? foot, akin to ? foot; hence originally, a table with four feet. See {Foot}.] 1. (Geom.) A plane figure bounded by four right lines, of which no two are parallel. 2. (Anat.) a A bone of the carpus at the base of the first metacarpal, or thumb. b A region on the ventral side of the brain, either just back of the pons Varolii or as in man, covered by the posterior extension of its transverse fibers. From WordNet r 1.6 [wn]: trapezium n 1: (in US) a quadrilateral with no parallel sides [ant: {parallelogram}] 2: the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals [syn: {trapezium bone}, {os trapezium}]
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