- Sibbaldius tectirostris
- Finback Fin"back`, n. (Zo["o]l.) Any whale of the genera {Sibbaldius}, {Bal[ae]noptera}, and allied genera, of the family {Bal[ae]nopterid[ae]}, characterized by a prominent fin on the back. The common finbacks of the New England coast are {Sibbaldius tectirostris} and {S. tuberosus}. [1913 Webster]
The Collaborative International Dictionary of English. 2000.