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⇱ blue whale - WordReference.com Dictionary of English


WordReference Random House Unabridged Dictionary of American English © 2026
blue′ whale′, 
  1. Mammalsa migratory baleen whale, Balaenoptera musculus, mostly of oceans and seas in the Southern Hemisphere, growing to a length of 100 ft. (30.5 m) 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. 
  • 1850–55

Collins Concise English Dictionary © HarperCollins Publishers::
blue whale n
  1. the largest mammal: a widely distributed bluish-grey whalebone whale, Sibbaldus (or Balaenoptera) musculus, closely related and similar to the rorquals: family Balaenopteridae
'blue whale' also found in these entries (note: many are not synonyms or translations):
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