\Sperm" whale`\ (Zo["o]l.)
A very large toothed whale ({Physeter macrocephalus}), having
a head of enormous size. The upper jaw is destitute of teeth.
In the upper part of the head, above the skull, there is a
large cavity, or case, filled with oil and spermaceti. This
whale sometimes grows to the length of more than eighty feet.
It is found in the warmer parts of all the oceans. Called
also {cachalot}, and {spermaceti whale}.
{Pygmy sperm whale} (Zo["o]l.), 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}.
{Sperm-whale porpoise} (Zo["o]l.), a toothed cetacean
   ({Hypero["o]don 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}.