fin whale(n = noun.animal) balaenoptera physalus, common rorqual, finback, finback whale - large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific;
is a kind of razorback, rorqual
is a member of balaenoptera, genus balaenoptera

baleen whale, beaked whale, black whale, blue whale, bottle-nosed whale, bottlenose whale, bowhead whale, caudal fin, dorsal fin, dwarf sperm whale, fin, fin de si'8acle, fin de siecle, fin keel, finback whale, gray whale, greenland whale, grey whale, heterocercal fin, homocercal fin, humpback whale, killer whale, minke whale, pectoral fin, pelvic fin, piked whale, pilot whale, pygmy sperm whale, right whale, sei whale, sperm whale, tail fin, toothed whale, ventral fin, vertical fin, whale, whale louse, whale oil, whale shark, whale sucker, whalebone whale, white whale