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
Synonyms
Examples of hairline in a Sentence
The plate had a hairline running across it.
He has a receding hairline.
Recent Examples on the Web
But right here, this is the shot when No. 39 comes in and his hairline of his helmet strikes the helmet of the runner who is already on the ground.
—
Pete Grathoff, Kansas City Star, 20 Jan. 2025
Marcus Freeman, the 39-year-old coach with the cool demeanor and flawless hairline, is much harder to dislike, even for fans who have no particular affection for Notre Dame.
—Austin Meek, The Athletic, 16 Jan. 2025
Mortensen finished the vulnerable clip by showing off his post-op hairline in the car, a bandage wrapped around the transplant site.
—Bailey Richards, People.com, 12 Jan. 2025
The man turns a receding hairline into a character choice better than any actor in the business.
—Joe Reid, Vulture, 26 Dec. 2024
See all Example Sentences for hairline 
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Pete Grathoff, Kansas City Star, 20 Jan. 2025
Marcus Freeman, the 39-year-old coach with the cool demeanor and flawless hairline, is much harder to dislike, even for fans who have no particular affection for Notre Dame.
—Austin Meek, The Athletic, 16 Jan. 2025
Mortensen finished the vulnerable clip by showing off his post-op hairline in the car, a bandage wrapped around the transplant site.
—Bailey Richards, People.com, 12 Jan. 2025
The man turns a receding hairline into a character choice better than any actor in the business.
—Joe Reid, Vulture, 26 Dec. 2024
See all Example Sentences for hairline
Dictionary Entries Near hairline
Cite this Entry
“Hairline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hairline. Accessed 24 Jan. 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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