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Longman Dictionary of Contemporary English
baby tooth
noun
EXAMPLES FROM CORPUS
▪ I tried to thank him but my lip was split, and a dislodged late baby tooth impeded articulate expression.
Wiktionary
baby tooth

n. a tooth which will be replaced as a child ages, as opposed to an adult permanent tooth; a milk tooth

WordNet
baby tooth

n : one of the first temporary teeth of a young mammal (one of 20 in children) [syn: primary tooth, deciduous tooth, milk tooth]