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
Sutskever, who was born in the Soviet Union in 1986, has a receding hairline, dark eyes, and a habit of pausing, unblinking, while choosing his words.
—
Ronan Farrow, New Yorker, 6 Apr. 2026
The rash usually begins as flat red spots that appear on the face at the hairline and spread downward to the neck, torso, arms, legs and feet.
—Ashley J. Dimella, FOXNews.com, 3 Apr. 2026
Can Hims regrow a receding hairline?
—Rebecca Strong, USA Today, 3 Apr. 2026
In a clip at the start of the TikTok, the influencer pulled her hair back to show some gray strands around her hairline.
—Tabitha Parent, PEOPLE, 2 Apr. 2026
See All Example Sentences for hairline
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Ronan Farrow, New Yorker, 6 Apr. 2026
The rash usually begins as flat red spots that appear on the face at the hairline and spread downward to the neck, torso, arms, legs and feet.
—Ashley J. Dimella, FOXNews.com, 3 Apr. 2026
Can Hims regrow a receding hairline?
—Rebecca Strong, USA Today, 3 Apr. 2026
In a clip at the start of the TikTok, the influencer pulled her hair back to show some gray strands around her hairline.
—Tabitha Parent, PEOPLE, 2 Apr. 2026
See All Example Sentences for hairline
Cite this Entry
“Hairline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hairline. Accessed 6 Apr. 2026.
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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