Definition of blue whale
: a very large baleen whale (Balaenoptera musculus synonym Sibbaldus musculus) that may reach a weight of 150 tons (136 metric tons) and a length of 100 feet (30 meters) and is generally considered the largest living animal
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Merriam-Webster unabridged
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Time Traveler for blue whale
The first known use of blue whale was in 1851
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