sperm whale : Idioms & Phrases

• noun small sperm whale of warm waters of both coasts of North America
  Kogia breviceps.
  

WordNet

• (Zoöl.), a small whale (Kogia breviceps), seldom twenty feet long, native of tropical seas, but occasionally found on the American coast. Called also snub-nosed cachalot.

Webster 1913

• (Zoöl.), a toothed cetacean (Hyperoödon bidens), found on both sides of the Atlantic and valued for its oil. The adult becomes about twenty-five feet long, and its head is very large and thick. Called also bottle-nosed whale.

Webster 1913