Definition of: trapezium

(trə·pē′zē·əm) noun plural ·zi·a (-zē·ə)
1. Geom. a A four-sided plane figure of which no two sides are parallel. b In England, a quadrilateral of which two sides are parallel; a trapezoid.
2. Anat. a The bone of the distal row of the carpus situated on the radial side at the base of the thumb. b A band of transverse fibers found in the pons Varolii of the brain.
3. Astron. The four brightest stars in the nebula of Orion, at the angles of a trapezium. [<NL <Gk. trapezion, dim. of trapeza a table, lit., a four-footed (bench) <tetra- four + peza foot]
TRAPEZIUM