Longman Dictionary of Contemporary English homepage

hairline

 noun
     
Related topics: Hair and Beauty
hair‧line [countable]
1DCB the line around your head, especially at the front, where your hair starts growing:
He had put on weight, and his hairline was beginning to recede.
2

a hairline crack/fracture

MI a very thin crack:
a hairline fracture in a bone
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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