Trapezium
Pronunciation : Tra*pe"zi*um, n.; pl. E. Trapeziums
Part of Speech : L.
Etymology : [NL., fr. Gr. Tetra-) + Foot.]
Definition : 1. (Geom.)
Defn: 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.
Trapezia.
Source : Webster's Unabridged Dictionary, 1913