Trapeziums

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]