Source : Webster's Revised Unabridged Dictionary (1913)

Pelecoid \Pel"e*coid\, n. [Gr. ? a hatchet + -oid.] (Geom.)
   A figure, somewhat hatched-shaped, bounded by a semicircle
   and two inverted quadrants, and equal in area to the square
   ABCD inclosed by the chords of the four quadrants. [Written
   also {pelicoid}.] --Math. Dict.