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"pointed tooth," late 14c., from Latin caninus "of the dog," genitive of canis "dog" (source of Italian cane, French chien), from PIE root *kwon- "dog" (cf. Greek kyon, Old English hund, Old High German hunt, Old Irish cu, Welsh ci, Sanskrit svan-, Avestan spa, Russian sobaka (apparently from an Iranian source, e.g. Median spaka), Armenian shun, Lithuanian šuo). The noun meaning "dog" is first recorded 1869.
c.1600, of teeth, from canine (n.) or Latin caninus. Meaning "pertaining to a dog or dogs" is from 1620s.
canine ca·nine (kā'nīn)
Of, relating to, or characteristic of members of the family Canidae.
Of, relating to, or being one of the pointed conical teeth located between the incisors and the first bicuspids.
An animal of the family Canidae, especially a dog.
A canine tooth.