Etymology
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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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Definitions of tusk
1
tusk (v.)
stab or pierce with a horn or tusk;
Synonyms: horn
tusk (v.)
remove the tusks of animals;
tusk an elephant
Synonyms: detusk
2
tusk (n.)
a hard smooth ivory colored dentine that makes up most of the tusks of elephants and walruses;
Synonyms: ivory
tusk (n.)
a long pointed tooth specialized for fighting or digging; especially in an elephant or walrus or hog;
From wordnet.princeton.edu