n. the genus comprising the most common varieties of shad. It replaces the older term Clupea. See also shad. Syn. -- genus Alosa. [ WordNet 1.5 ]
{ ‖ } n. [ NL. megalosaurus, fr. Gr. me`gas, mega`lh, great + say^ros lizard: cf. F. mégalosaure. ] (Paleon.) A gigantic carnivorous dinosaur, whose fossil remains have been found in England and elsewhere. [ 1913 Webster ]