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. [1913 Webster]

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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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