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The Collaborative International Dictionary of English v.0.48 (gcide)

Whale \Whale\, n. [OE. whal, AS. hw[ae]l; akin to D. walvisch,
G. wal, walfisch, OHG. wal, Icel. hvalr, Dan. & Sw. hval,
hvalfisk. Cf. {Narwhal}, {Walrus}.] (Zool.)
Any aquatic mammal of the order {Cetacea}, especially any one
of the large species, some of which become nearly one hundred
feet long. Whales are hunted chiefly for their oil and
baleen, or whalebone.
[1913 Webster]

Note: The existing whales are divided into two groups: the
toothed whales ({Odontocete}), including those that
have teeth, as the cachalot, or sperm whale (see {Sperm
whale}); and the baleen, or whalebone, whales
({Mysticete}), comprising those that are destitute of
teeth, but have plates of baleen hanging from the upper
jaw, as the right whales. The most important species of
whalebone whales are the bowhead, or Greenland, whale
(see Illust. of {Right whale}), the Biscay whale, the
Antarctic whale, the gray whale (see under {Gray}), the
humpback, the finback, and the rorqual.
[1913 Webster]

{Whale bird}. (Zool.)
(a) Any one of several species of large Antarctic petrels
which follow whaling vessels, to feed on the blubber and
floating oil; especially, {Prion turtur} (called also
{blue petrel}), and {Pseudoprion desolatus}.
(b) The turnstone; -- so called because it lives on the
carcasses of whales. [Canada]

{Whale fin} (Com.), whalebone. --Simmonds.

{Whale fishery}, the fishing for, or occupation of taking,
whales.

{Whale louse} (Zool.), any one of several species of degraded
amphipod crustaceans belonging to the genus {Cyamus},
especially {Cyamus ceti}. They are parasitic on various
cetaceans.

{Whale's bone}, ivory. [Obs.]

{Whale shark}. (Zool.)
(a) The basking, or liver, shark.
(b) A very large harmless shark ({Rhinodon typicus}) native
of the Indian Ocean. It sometimes becomes sixty feet
long.

{Whale shot}, the name formerly given to spermaceti.

{Whale's tongue} (Zool.), a balanoglossus.
[1913 Webster]