the largest mammal: a widely distributed bluish-grey whalebone whale, Sibbaldus (or Balaenoptera) musculus, closely related and similar to the rorquals: family Balaenopteridae
Also called: sulphur-bottom
blue whale in American English
a rorqual (Balaenoptera musculus) with a blue-gray back: the largest animal that has ever lived, reaching a length of over 30 m (100 ft) and weighing up to 136,000 kg (c. 150 tons)
Examples of 'blue whale' in a sentence
blue whale
WHAT'S the difference between a small blue whale and great white whale?