noun, plural (especially collectively) gar, (especially referring to two or more kinds or species) gars.
1.
Also called garfish, garpike.any predaceous freshwater fish of the genus Lepisosteus, of North America, covered with hard, diamond-shaped scales and having long jaws with needlelike teeth.
"pike-like fish," 1765, Amer.Eng., shortening of garfish (c.1440), from O.E. gar "spear," from P.Gmc. *gaizo- (cf. O.N. geirr, O.H.G. ger, Ger. Ger "spear").