(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.
a long, pointed, or protruding tooth.
a projection resembling the tusk of an animal.
Also called gain. Carpentry. a diagonally cut shoulder at the end of a timber for strengthening a tenon.
verb (used with object)
to dig up or tear off with the tusks.
to gore with a tusk.
verb (used without object)
to dig up or thrust at the ground with the tusks.

before 900; Middle English, metathetic variant of tux, Old English, variant of tusc tush2; cognate with Old Frisian tusk; akin to tooth

tuskless, adjective
tusklike, adjective
untusked, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tusk (tʌsk)
1.  a pointed elongated usually paired tooth in the elephant, walrus, and certain other mammals that is often used for fighting
2.  the canine tooth of certain animals, esp horses
3.  a sharp pointed projection
4.  building trades Also called: tusk tenon a tenon shaped with an additional oblique shoulder to make a stronger joint
5.  to stab, tear, or gore with the tusks
[Old English tūsc; related to Old Frisian tosk; see tooth]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. tux, tusc, cognate with O.Fris. tusk, probably from P.Gmc. *tunthskaz (cf. Goth. tunþus "tooth"), extended form of the root of tooth. But there are no certain cognates outside Anglo-Frisian.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
tusk   (tŭsk)  Pronunciation Key 
A long, pointed tooth, usually one of a pair, projecting from the mouth of certain animals, such as elephants, walruses, and wild pigs. Tusks are used for procuring food and as weapons.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The interior pulp of a narwhal tusk contains a system of nerves that runs the
  full length of the tooth.
Each tusk bears a distinctive carved band, twining from base to tip and
  connecting scenes and characters.
Prehistoric humans painted images of the animals on cave walls and carved their
  likeness in fragments of mammoth tusk.
The narwhal's single, spiral tusk has always been a mystery.
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