Meaning of “hair” - Learner’s Dictionary

hair

noun uk us /heər/
HEAD [ U ]

A1 the thin, thread-like parts that grow on your head:

a girl with long, fair hair
PIECE [ C ]

B2 one of the thin thread-like parts that grow on a person's or animal's skin:

My black skirt was covered in cat hairs.
→ See also pubic hair , let your hair down , pull/tear your hair out , split hairs

(Definition of “hair” from the Cambridge Learner’s Dictionary © Cambridge University Press)