noun
: a large tropical clam ( Hippopus hippopus ) related to and much resembling the giant clam ( Tridacna derasi ) — called also horseshoe clam
noun
: a large tropical clam ( Hippopus hippopus ) related to and much resembling the giant clam ( Tridacna derasi ) — called also horseshoe clam
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012