noun
hairline
HEHR-lyn
noun
1
The edge along the forehead or scalp where hair begins to grow.
"His hairline had receded noticeably by his forties."
2
A very thin crack, line, or fracture.
"X-rays revealed a hairline fracture in her wrist."
How to Use Hairline
Learner’s notesIn plain EnglishEither the edge of your hair on your forehead, or a crack so thin it looks like a strand of hair.
Common pairings
a receding hairline
a hairline fracture
a hairline crack
Word Forms
hairlines plural
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His _____ had receded noticeably by his forties.
Etymology
From "hair" and "line," describing something as thin as a strand of hair.