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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Fin·back n. Zool. Any whale of the genera Sibbaldius, Balænoptera, and allied genera, of the family Balænopteridæ, characterized by a prominent fin on the back. The common finbacks of the New England coast are Sibbaldius tectirostris and S. tuberosus.
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