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Tusk definition, (in certain animals) a tooth developed to great length, usually one of a pair, as in the elephant, walrus, and wild boar, but singly in the narwhal. See more. Dictionary.com
Tusks differ in shape, size and length thus researchers can use them to identify the individual. These bulky mammals use their bulky teeth (tusks) for their defense and feeding. Elephants tusks are mostly dangerous for them because it is their tusk which led to their senseless slaughter by hunters.