pl. (see fish) -·fish·, -·fish·es
any of a subclass (Asteroidea) of echinoderms with a hard, spiny skeleton and five or more arms or rays arranged like the points of a star; asteroid
nounpl. starfish or star·fish·es
Any of various marine echinoderms of the class Asteroidea, characteristically having a thick, often spiny body with five arms extending from a central disk. Also called asteroid, sea star.
(plural starfishes or starfish)
star + fish