noun.
A name of the sperm-whale, Physeter or Catodon macrocephalus, a large, toothed cetacean of the family Physeteridæ or Catodontiæ, having teeth in the lower jaw, and an enormous blunt head, in a cavity of which spermaceti is contained, and sometimes attaining a length Of 80 feet.
noun.
plural The sperm-whales as a family of cetaceans; the Physeteridæ.