[fin-bak] 
| any baleen whale of the genus Balaenoptera, having a prominent dorsal fin, esp. B. physalus, of the Atlantic and Pacific coasts; rorqual: an endangered species. |
| fin·back (fĭn'bāk') n. A rorqual, especially Balaenoptera physalus of the Atlantic and Pacific coasts, that attains a length of about 21 meters (70 feet). Also called fin whale. |
| fin whale n. See finback. |
