Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A large baleen whale, Balaenoptera physalus, that has a ridge on its back; the fin whale.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A finner or fin-whale.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific

Etymologies

fin +‎ back (Wiktionary)

Examples

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  • "It the museum even had the skeleton of a finback whale that had washed up in the 1960s..."
    --Nathaniel Philbrick, In the Heart of the Sea: The Tragedy of the Whaleship Essex, 232

    May 1, 2008