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blue whale

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)

See blue whale in American Heritage Dictionary 4

noun

A very large whalebone whale (Balaenoptera musculus) having a bluish-gray back, yellow underparts, and several ventral throat grooves. It is considered the largest living animal, sometimes reaching a length of 30.5 meters (100 feet). Also called sulphur-bottom.

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