What is the meaning of tusk?

noun

• A hard smooth ivory colored dentine that makes up most of the tusks of elephants and walruses.
  • synonyms: ivory
• A long pointed tooth specialized for fighting or digging; especially in an elephant or walrus or hog.

verb

• Stab or pierce with a horn or tusk.
  • usage: "the rhino horned the explorer"
  • synonyms: horn
• Remove the tusks of animals.
  • usage: "tusk an elephant"
  • synonyms: detusk