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
How to Apply: Apply a few drops directly to your scalp, along the hairline, widening part, and/or any other areas of concern.
—
Kiana Murden, Vogue, 15 July 2025
He is shorn of his rakish mustache, and a scruffy isthmus sprouts at the crown of his receding hairline.
—Jessica Winter, New Yorker, 14 July 2025
People from diverse backgrounds visit the clinic, trusting it to provide results that match their natural hairline and appearance.
Leadership & Vision Behind the Clinic
The clinic is named after Asli Tarcan.
—Daniel Fusch, USA Today, 12 July 2025
Broken concrete, a hairline crack in a driveway, and lines between pavers provide plenty of space for seeds to settle and sprout all year long.
—Brandee Gruener, Southern Living, 2 July 2025
See All Example Sentences for hairline
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Kiana Murden, Vogue, 15 July 2025
He is shorn of his rakish mustache, and a scruffy isthmus sprouts at the crown of his receding hairline.
—Jessica Winter, New Yorker, 14 July 2025
People from diverse backgrounds visit the clinic, trusting it to provide results that match their natural hairline and appearance.
Leadership & Vision Behind the Clinic
The clinic is named after Asli Tarcan.
—Daniel Fusch, USA Today, 12 July 2025
Broken concrete, a hairline crack in a driveway, and lines between pavers provide plenty of space for seeds to settle and sprout all year long.
—Brandee Gruener, Southern Living, 2 July 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 25 Jul. 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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