hair

noun

ˈher 

often attributive

1

a

: a slender threadlike outgrowth of the epidermis of an animal

especially : one of the usually pigmented filaments that form the characteristic coat of a mammal

b

: the hairy covering of an animal or a body part

especially : the coating of hairs on a human head

2

: haircloth

3

a

: a minute distance or amount

won by a hair

b

: a precise degree

aligned to a hair

4

obsolete : nature, character

5

: a filamentous structure that resembles hair

leaf hair

hairless adjective

hairlessness noun

hairlike

ˈher-ˌlīk 

adjective

Illustration of hair

• 1 shaft
• 2 sebaceous gland
• 3 epidermis
• 4 dermis
• 5 hair follicle
• 6 bulb
• 7 papilla

Phrases

in one's hair

: persistently and annoyingly in one's presence

can't work with you in my hair all day

out of one's hair

: out of one's way : not in one's hair

keep the children out of his hair for a while

Synonyms

• inch
• neck
• step
• hairline

Examples of hair in a Sentence

He plucked a hair from his arm.

There are dog hairs all over my coat.

The hair on her arms is blond.

He has a lot of hair on his chest.

He got his hair cut last week.

He has a thick head of hair.

a balding man who is losing his hair

He won the race by a hair.

He was a hair off on the count.

Recent Examples on the Web

In another performance, children wore long floral dresses and red lipstick, their hair in buns. —Jemma Stephenson, San Diego Union-Tribune, 14 Sep. 2025

Among them were countless era-defining releases that are still among the best movies ever made—of any genre—from the haunting Rebecca to the gripping Rear Window, and the ravishing Vertigo to the hair-raising Psycho. —Radhika Seth, Vogue, 13 Sep. 2025

Jerry Neuheisel, assistant head coach and tight ends coach, running his hands through his blond hair, stunned. —Mirjam Swanson, Oc Register, 13 Sep. 2025

In ants, hair is one of the criteria that helps differentiate species. —Ashley Strickland, CNN Money, 13 Sep. 2025

Word History

Etymology

Middle English, from Old English hǣr; akin to Old High German hār hair

First Known Use

before the 12th century, in the meaning defined at sense 1a

Phrases Containing hair

• angel-hair pasta
• baby hair
• bad hair day
• big hair
• camel hair
• camel's hair
• full head of hair
• guard hair
• hair ball
• hair cell
• hair follicle
• hair gel
• hair of the dog (that bit you)
• hair-raiser
• hair-raising
• hair's breadth
• hair seal
• hair shirt
• hair slide
• hair spray
• hair style
• hair stylist
• hair trigger
• hide nor hair
• hide or hair
• keep your hair on
• let one's hair down
• long-hair
• make one's hair curl
• make one's hair stand on end
• not have a hair out of place
• not turn a hair
• pull one's hair out
• root hair
• tear one's hair
• tear one's hair out
• turn a hair
• Venus hair
• Venus hair fern

Rhymes for hair

• air
• ayre
• bahr
• bare
• blare
• care
• chair
• claire
• ere
• err
• eyre
• fair

Kids Definition

hair

noun

ˈha(ə)r 

ˈhe(ə)r

1

a

: a slender threadlike growth from the skin of an animal

especially : one that usually contains coloring and forms part of the characteristic coat of a mammal

b

: a covering or growth of hairs of an animal or a body part

2

: a tiny distance or amount

won by a hair

3

: a threadlike structure that resembles hair

leaf hairs

haired

ˈha(ə)rd

ˈhe(ə)rd

adjective

hairless

ˈha(ə)r-ləs

ˈhe(ə)r-

adjective

hairlike

-ˌlīk 

adjective

Medical Definition

hair

noun

ˈha(ə)r, ˈhe(ə)r 

often attributive

1

: a slender threadlike outgrowth of the epidermis of an animal

especially : one of the usually pigmented filaments that form the characteristic coat of a mammal

2

: the hairy covering of an animal or a body part

especially : the coating of hairs on a human head

hairlike

-ˌlīk 

adjective