trapezium

  1. Noun.  (context, geometry) A four-sided polygon with two sides parallel; a trapezoid (modern sense).
  2. Noun.  (context, geometry) A four-sided polygon with no parallel sides and no sides equal; a simple convex irregular quadrilateral.
  3. Noun.  A bone of the carpus at the base of the first metacarpal, or thumb.
  4. Noun.  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.

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This entry was last updated on RefTopia from its source on 3/20/2012.