any of several whales of the genus Balaenoptera; finback.

1820–30; < French < Norwegian rørkval, Old Norse reytharhvalr, equivalent to reyth(a)r rorqual (akin to rauthr red1) + hvalr whale1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rorqual (ˈrɔːkwəl)
Also called: finback any of several whalebone whales of the genus Balaenoptera, esp B. physalus: family Balaenopteridae. They have a dorsal fin and a series of grooves along the throat and chest
[C19: from French, from Norwegian rörhval, from Old Norse reytharhvalr, from reythr (from rauthr red) + hvalr whale]

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Example sentences
Gulping behaviour in rorqual whales: underwater observations and functional interpretation.
These were easily identified due to their bumpy rostrum, rorqual streaks, blowhole placement and dorsal fin.
Reconstructing the rorqual phylogeny: with comments on the use of molecular and morphological data for systematic study.
The fin whale is the second largest rorqual in size and is also cosmopolitan in distribution.
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