As an adjective, canine relates to dogs. As a noun, it can mean a dog or a pointed tooth between the incisors and premolars in mammals.
From Latin 'caninus' meaning 'of a dog,' from 'canis' (dog). It entered English through scientific and medical language. The tooth is called 'canine' because its long, pointed shape resembles a dog’s fang.
Every time you feel your 'fangs' with your tongue, you’re touching your canine teeth—literally your 'dog teeth.' The same root gives us 'canid' for the dog family and 'canine unit' for police dogs. It shows how deeply the image of the dog is built into how we name parts of our own bodies.
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