trapezium
NounWordNet 3.0
Noun (3)
- a quadrilateral with no parallel sides
- a multiple star in the constellation of Orion
- the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpalsSynonyms: trapezium boneos trapezium
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onerousadjective
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Webster's Dictionary (GCIDE)
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]