(n.) Any whale of the genera Sibbaldius, Balaenoptera, and allied genera, of the family Balaenopteridae, characterized by a prominent fin on the back. The common finbacks of the New England coast are Sibbaldius tectirostris and S. tuberosus.
Thesaurus Entries
Loch Ness monster, alevin, baleen whale, beluga, benthon, benthos, blackfish, blue whale, cachalot, dolphin, finback, fingerling, fish, fry, game fish, grilse, humpback, killer, killer whale, kipper, man-eater, man-eating shark, marine animal, minnow, minny, narwhal, nekton, panfish, plankton, porpoise, salmon, sea monster, sea pig, sea serpent, sea snake, shark, smolt, sperm whale, sponge, sulfur-bottom whale, tropical fish, whale
