The word 'incisor' refers specifically to front teeth, not molars or canines. He used his incisors, not his molars, to bite into the apple.
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Function Clue
'Incisor' comes from a Latin word meaning 'to cut', explaining their use in biting and slicing food. Rabbits rely on their sharp incisors to cut through vegetation.
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Common Confusion
Don't confuse 'incisor' with 'wisdom tooth', which is a type of molar. His incisors were perfectly aligned, unlike his troublesome wisdom teeth.