has quality has quality elongated protruding calcareous tooth tusk A calcareous tooth that is elongated and protrudes from the mouth. Elongated, continuously growing front teeth, usually but not always in pairs, that protrude well beyond the mouth of certain mammal species. They are most commonly canines, as with warthogs, pig, and walruses, or, in the case of elephants and narwhals, elongated incisors. In most tusked species both the males and the females have tusks although the males are larger. Tusks are generally curved, though the narwhal's sole tusk is straight and has a helical structure. In the elephant, the tusks were originally second incisors. Continuous growth is enabled by formative tissues in the apical oproperty_value external_definitionof the roots of the teeth SCTID:54040005 Wikipedia:Tusk UBERON:0010879