hair·​line | \ˈher-ˈlīn \

Definition of hairline 

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

3a : a textile design consisting of lengthwise or crosswise lines usually one thread wide

b : a fabric with such a design

4a : the outline of scalp hair especially on the forehead

b : the way the hair frames the face

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Other Words from hairline

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

Everything exposed to the sun — your face, neck, décolletage, ears, hairline, hands, arms, etc. Amina Lake Abdelrahman, Good Housekeeping, "QUIZ: How Normal Are Your Skincare Habits?," 10 Sep. 2018 During the actual procedure, your doctor will make an incision through your abdominal wall (usually horizontally near your pubic hairline), the Mayo Clinic says. Korin Miller, SELF, "Here’s What An Emergency C-Section Actually Is," 9 Aug. 2018 While these are often easy to spot, small chip or hairline fractures can be difficult for even a specialist to spot. John Timmer, Ars Technica, "AIs trained to help with sepsis treatment, fracture diagnosis," 27 Oct. 2018 DeGrom is a more vital player than relief pitcher Anthony Swarzak (oblique injury), and catchers Travis d’Arnaud (season-ending Tommy John surgery) and Kevin Plawecki (expected to return later this month from a hairline fracture in his left hand). James Wagner, New York Times, "Jacob deGrom Is Injured as Mets Lose Division Lead," 2 May 2018 The key to making the wig look real is actually having the person's hairline in mind. Teryn Payne, Allure, "This Lace-Front Wig Is So Perfectly Blended, It’s Going Viral," 13 Mar. 2018 The key to keeping your braid uniform is to take a section that goes all the way from your hairline back to the braid, not just a chunk from the front. Kara Mcgrath, Seventeen, "How To Master a Perfect French Braid," 22 Feb. 2018 Gently kiss down the forehead, starting at the hairline, along the slope of the nose, ending at the lips. Bernadette Anat, Seventeen, "How to Kiss: 20 Secrets Good Kissers Know," 8 Jan. 2018 Our high blood pressure and receding hairlines do that. James Breakwell, Indianapolis Star, "Xploding Unicorn: Dads don't need a special day to remind them they're dads," 15 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hairline.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of hairline

1846, in the meaning defined at sense 1

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Dictionary Entries near hairline


hair kiln



hair man

hair moss

hair moth

Statistics for hairline

Last Updated

30 Nov 2018

Look-up Popularity

Time Traveler for hairline

The first known use of hairline was in 1846

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More Definitions for hairline



English Language Learners Definition of hairline

: a thin line or crack

: the line where your hair starts on your forehead


hair·​line | \-ˈlīn \

Medical Definition of hairline 

: the outline of scalp hair especially on the forehead

Other Words from hairline

hairline adjective

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More from Merriam-Webster on hairline

Rhyming Dictionary: Words that rhyme with hairline

Thesaurus: All synonyms and antonyms for hairline

Spanish Central: Translation of hairline

Nglish: Translation of hairline for Spanish Speakers

Comments on hairline

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living or existing for a long time

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