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
Enriched with ingredients that promote hair growth, like castor oil, the hairline looks and feels stronger with every use.
—
Jailynn Taylor, Allure, 2 Apr. 2025
Before styling wet hair—or, if hair is dry, just before bed—use the needle-nose applicator to create a center part, then apply a thin layer of product along the hairline.
—Air Mail, 22 Mar. 2025
Large Cracks on Foundation Walls Small hairline cracks in the foundation walls are relatively common and can typically be fixed by the average DIYer using epoxy or polyurethane to seal the cracks.
—Timothy Dale, Better Homes & Gardens, 20 Mar. 2025
The lack of dihydrotestosterone receptors across the rest of our bodies explains why these areas can remain hairy even after our hairlines have lost their fight against these hormonal changes.
—Rj MacKenzie, Popular Science, 20 Mar. 2025
See All Example Sentences for hairline
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Jailynn Taylor, Allure, 2 Apr. 2025
Before styling wet hair—or, if hair is dry, just before bed—use the needle-nose applicator to create a center part, then apply a thin layer of product along the hairline.
—Air Mail, 22 Mar. 2025
Large Cracks on Foundation Walls Small hairline cracks in the foundation walls are relatively common and can typically be fixed by the average DIYer using epoxy or polyurethane to seal the cracks.
—Timothy Dale, Better Homes & Gardens, 20 Mar. 2025
The lack of dihydrotestosterone receptors across the rest of our bodies explains why these areas can remain hairy even after our hairlines have lost their fight against these hormonal changes.
—Rj MacKenzie, Popular Science, 20 Mar. 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 8 Apr. 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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