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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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: Webster's Revised Unabridged Dictionary (1913)