any baleen whale of the genus Balaenoptera, having a prominent dorsal fin, especially B. physalus, of the Atlantic and Pacific coasts; rorqual: an endangered species.
Also called finback whale, fin whale.

1715–25; fin + back1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
finback (ˈfɪnˌbæk)
another name for rorqual

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Finback and minke whales appear first, followed by humpback whales in midsummer.
The dorsal fin is located far back on the top of the body and is smaller than
  that of finback or sei whales.
Occasionally humpback and finback whales and walrus are sighted.
We had a couple of finback whales around the boat and a huge ocean sunfish.
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