Etymology
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gar (n.)

pike-like fish, 1765, American English, shortening of garfish (mid-15c.), from fish (n.) + Middle English gare, gore "a spear," from Old English gar "spear," from Proto-Germanic *gaisa- "spear" (source also of Old Norse geirr "spear; point of an anvil," Old Saxon, Old High German ger, German Ger "spear"), from PIE *ghaiso- "a stick, spear" (see goad (n.)). The fish so called for its long sharp snout. Compare Edgar, garlic.

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Definitions of gar

gar (n.)
primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth;
Synonyms: garfish / garpike / billfish / Lepisosteus osseus
gar (n.)
elongate European surface-dwelling predacious fishes with long toothed jaws; abundant in coastal waters;
Synonyms: needlefish / billfish
From wordnet.princeton.edu