tusk (n.)

Old English tusc, also transposed as tux, "long, pointed tooth protruding from the mouth of an animal," cognate with Old Frisian tusk, probably from Proto-Germanic *tunthsk- (source also of Gothic tunþus "tooth"), from an extended form of PIE root *dent- "tooth." But "there are no certain cognates outside of the Anglo-Frisian area" [OED].

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