Definition of sei whale in English:
A small rorqual with dark steely-grey skin and white grooves on the belly.
- Balaenoptera borealis, family Balaenopteridae
- Fairly secretive visitors among the larger rorquals are the fin whale and its slightly smaller cousin, the sei whale.
- Stone said she was dismayed by news suggesting the Japanese government not only wants to increase its take of minke whales, but that Japan now intends to expand its operations to hunt the endangered sei whale in the North Pacific.
- Likewise, the lungs of large whales including fin whales and sei whales and pilot whales show evidence of progressive alveolar collapse in response to increased hydrostatic pressure.
Early 20th century: from Norwegian sejhval.
Definition of sei whale in:
- US English dictionary
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