hairline

noun

hair·​line ˈher-ˈlīn 

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

: hairbreadth

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

Synonyms of hairline

• inch
• hair
• neck
• step

Examples of hairline in a Sentence

The plate had a hairline running across it.

He has a receding hairline.

Recent Examples on the Web

Thirty-two-year-old Ayca Bozok from Germany traveled to Turkey, where her mother was born, to receive an FUE hair transplant across her hairline and parting. —Leah Dolan, CNN Money, 27 Nov. 2025

He is often called the Picasso of Hair, a nickname that reflects his focus on natural hairline design and attention to detail. —Wyles Daniel, Freep.com, 25 Nov. 2025

For a more sculpted look, use the narrow side of the bullet to apply bronzer more precisely to the hairline, jawline, cheekbones, and any other areas that call for some contour. —Jenny Berg, Vogue, 22 Nov. 2025

Tiny bumps along the hairline or base of braids are warning signs. —Donnetta Monk, Essence, 21 Nov. 2025

Word History

First Known Use

1846, in the meaning defined at sense 1

Rhymes for hairline

• affine
• airline
• align
• aline
• assign
• baseline
• beamline
• benign
• bloodline
• bovine
• byline
• canine

Kids 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