Blue-whale

blue whale

noun
a migratory baleen whale, Balaenoptera musculus, mostly of oceans and seas in the Southern Hemisphere, growing to a length of 100 feet (30.5 meters) and having a furrowed, slate-blue skin mottled with lighter spots, in some seas acquiring a yellowish coating of diatoms on the underside: the largest mammal ever known, it is now endangered.
Also called sulfur-bottom.


Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blue whale
 
n
Also called: sulphur-bottom the largest mammal: a widely distributed bluish-grey whalebone whale, Sibbaldus (or Balaenoptera) musculus, closely related and similar to the rorquals: family Balaenopteridae

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