hairline

noun

hair·​line ˈher-ˈlīn How to pronounce hairline (audio)
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Seemingly, this was the equivalent to modern day hairline lasering–a treatment at least one Kardashian has confessed to. Jennifer Adams, StyleCaster, 19 May 2025 While baldness, thinning, and hairline woes are more commonly associated with men, female pattern hair loss is estimated to impact 40 percent of women before age 50. Maria Yagoda, Vox, 9 May 2025 In March 2024, hairline cracks began forming along the entire length of a support beam on the top floor. Susannah Bryan, Sun Sentinel, 6 May 2025 This mineral sunscreen has a brush applicator that’s easy to apply to your part and hairline. Rebecca Shinners, Travel + Leisure, 5 May 2025 See All Example Sentences for hairline

Word History

First Known Use

1846, in the meaning defined at sense 1

Time Traveler
The first known use of hairline was in 1846

Browse Nearby Words

Cite this Entry

“Hairline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hairline. Accessed 29 May. 2025.

Kids Definition

hairline

noun
hair·​line ˈha(ə)r-ˌlīn How to pronounce hairline (audio)
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 How to pronounce hairline (audio)
: the outline of scalp hair especially on the forehead
hairline adjective

More from Merriam-Webster on hairline

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