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Trape"zium (), 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.
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