O.E. fang "prey, spoils, a seizing or taking," from gefangen, pp. of fon "seize, take, capture," from P.Gmc. *fango- (cf. O.N. fanga, Ger. fangen), from PIE base *pank-/*pak- "to make firm, fix;" connected to L. pax (gen. pacis) "peace." The sense of "canine tooth" (1555) probably developed from O.E. fengtoð, lit. "catching- or grasping-tooth."
(fāng) A long, pointed tooth in vertebrate animals or a similar structure in spiders, used to seize prey and sometimes to inject venom. The fangs of a poisonous snake, for example, have a hollow groove through which venom flows.