1
: a very slender line: such as
a
: a tiny line or crack on a surface
a hairline bone fracture
b
: a fine line connecting thicker strokes in a printed letter
2
3
a
: a textile design consisting of lengthwise or crosswise lines usually one thread wide
b
: a fabric with such a design
4
a
: the outline of scalp hair especially on the forehead
b
: the way the hair frames the face
hairline
adjective
Examples of hairline in a Sentence
The plate had a hairline running across it.
He has a receding hairline.
Recent Examples on the Web
Then, work quadrant by quadrant from the back of your head to your front hairline.
—
Caroline C. Boyle, USA TODAY, 19 Feb. 2025
Toth recommends shakers for areas with thinning and powders with brushes for hairline recession.
—Deanna Pai, Allure, 21 Feb. 2025
The rash tends to start at the hairline and spread down the body.
—Claire Bugos, Verywell Health, 20 Feb. 2025
Common symptoms, which typically appear 7 to 14 days after infection, include:
A distinct rash that usually starts on the hairline and moves down to the face and upper neck.
—Rob Williams, EverydayHealth.com, 19 Feb. 2025
See All Example Sentences for hairline
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Caroline C. Boyle, USA TODAY, 19 Feb. 2025
Toth recommends shakers for areas with thinning and powders with brushes for hairline recession.
—Deanna Pai, Allure, 21 Feb. 2025
The rash tends to start at the hairline and spread down the body.
—Claire Bugos, Verywell Health, 20 Feb. 2025
Common symptoms, which typically appear 7 to 14 days after infection, include:
A distinct rash that usually starts on the hairline and moves down to the face and upper neck.
—Rob Williams, EverydayHealth.com, 19 Feb. 2025
See All Example Sentences for hairline
Cite this Entry
“Hairline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hairline. Accessed 14 Mar. 2025.
Copy CitationKids Definition
hairline
noun
hair·line
ˈha(ə)r-ˌlīn 
ˈhe(ə)r-
1
a
: a very slender line
b
: a very thin crack on a surface
a hairline bone fracture
2
: the outline of the hair on the head and especially on the forehead
hairline
adjective
Medical Definition
hairline
noun
hair·line
-ˈlīn
: the outline of scalp hair especially on the forehead
hairline
adjective
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