(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.

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