From WordNet (r) 2.0 (August 2003) [wn]:
gar
n 1: primitive predaceous North American fish covered with hard
scales and having long jaws with needle-like teeth [syn:
garfish, garpike, billfish, Lepisosteus osseus]
2: elongate European surface-dwelling predacious fishes with
long toothed jaws; abundant in coastal waters [syn:
needlefish, billfish]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Gar \Gar\, v. t. [Of Scand. origin. See Gear, n.]
To cause; to make. [Obs. or Scot.] --Spenser.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Gar \Gar\, n. [Prob. AS. g[=a]r dart, spear, lance. The name is
applied to the fish on account of its long and slender body
and pointed head. Cf. Goad, Gore, v.] (Zool.)
(a) Any slender marine fish of the genera Belone and
Tylosurus. See Garfish.
(b) The gar pike. See Alligator gar (under Alligator),
and Gar pike.
[1913 Webster]
Gar pike, or Garpike (Zool.), a large, elongated ganoid
fish of the genus Lepidosteus, of several species,
inhabiting the lakes and rivers of temperate and tropical
America.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Garfish \Gar"fish`\, n. [See Gar, n.] (Zool.)
(a) A European marine fish (Belone vulgaris); -- called
also gar, gerrick, greenback, greenbone,
gorebill, hornfish, longnose, mackerel guide,
sea needle, and sea pike.
(b) One of several species of similar fishes of the genus
Tylosurus, of which one species (T. marinus) is
common on the Atlantic coast. {T. Caribb[ae]us}, a very
large species, and T. crassus, are more southern; --
called also needlefish. Many of the common names of the
European garfish are also applied to the American
species.
[1913 Webster]