Source : Webster's Revised Unabridged Dictionary (1913)

Trapezoid \Trap"e*zoid\, n. [Gr. ? trapezoid-shaped; ? table + ?
   shape, likeness: cf. F. trap['e]zo["i]de. See {Trapezium}.]
   1. (Geom.) A plane four-sided figure, having two sides
      parallel to each other.

   2. (Anat.) A bone of the carpus at the base of the second
      metacarpal, or index finger.

Trapezoid \Trap"e*zoid\, a.
   1. Having the form of a trapezoid; trapezoidal; as, the
      trapezoid ligament which connects the coracoid process and
      the clavicle.

   2. (Anat.) Of or pertaining to the trapezoid ligament; as,
      the trapezoid line.

Source : WordNet®

trapezoid
     n 1: a quadrilateral with two parallel sides
     2: the wrist bone between the trapezium and the capitate bones
        [syn: {trapezoid bone}, {os trapezoideum}]