sei whale

a rorqual, Balaenoptera borealis, inhabiting all seas: now greatly reduced in number.

1915–20; < Norwegian seihval, equivalent to sei (Old Norse seithr) coalfish + hval whale1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sei whale (seɪ)
a rorqual, Balaenoptera borealis
[C20: from Norwegian seihval, from sei coalfish (see saithe) + hval whale: so called because it follows coalfish in search of food]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The sei whale is smaller and more slender, has a uniformly colored body, and has a relatively smaller dorsal fin.
Nearly all information on sei whale reproduction comes from whaling data.
Cetacean experts believe that sei whale populations are increasing, but data are sparse.
The sei whale is considered a federally endangered species.
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