n.; pl. E. Trapeziums L. Trapezia [ NL., fr. Gr. &unr_; a little table, an irregular four-sided figure, dim. of &unr_; a table, for &unr_;; &unr_; (see Tetra-) + &unr_; foot, akin to &unr_; 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 ]