Pelecoid

Pel″e‐coid (?), n. [Gr. πέλεκυσ 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.