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humpback whale

noun
  1. a large whalebone whale of the genus Megaptera having long narrow flippers, and noted for its habit of arching deeply as it dives: once abundant in coastal waters, it is now rare but its numbers are increasing.
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Origin of humpback whale

First recorded in 1715–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018