hair Definition in Cambridge British English Dictionary
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Definition of "hair" - British English Dictionary

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hairnoun [C or U]

uk   /heər/  us   /her/
A1 the mass of thin thread-like structures on the head of a person, or any of these structures that grow out of the skin of a person or animal: He's got short dark hair. I'm going to have/get my hair cut. She brushed her long red hair. He had lost his hair by the time he was 25. He's starting to get a few grey hairs now. I found a hair in my soup.
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(Definition of hair from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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