hairpin

1 of 2

noun

hair·​pin ˈher-ˌpin 

1

: a pin to hold the hair in place

specifically : a long U-shaped pin

2

: something shaped like a hairpin

specifically : a sharp U-shaped turn in a road

hairpin

2 of 2

adjective

: having the shape of a hairpin

a hairpin turn

also : having hairpin turns

a steep hairpin road

Examples of hairpin in a Sentence

Recent Examples on the Web

Noun

Where military service is compulsory, and may only disappoint our best or even worst men, but can be interrupted, thank god, by life’s hairpin turns. —Ryan Lattanzio, IndieWire, 16 Feb. 2026

To keep the hairpin turns and runaway carousel rides to a minimum, Dietrich, his chief lieutenant, Josh Belovsky, and assistants Ryan Day and Tony Schifano — the latter joining the staff this year — hit the recruiting trail and transfer portal hard. —Brian Robin, Oc Register, 11 Feb. 2026

Adjective

To keep the hairpin turns and runaway carousel rides to a minimum, Dietrich, his chief lieutenant, Josh Belovsky, and assistants Ryan Day and Tony Schifano — the latter joining the staff this year — hit the recruiting trail and transfer portal hard. —Brian Robin, Oc Register, 11 Feb. 2026

To survive such an exceedingly close approach, the comet needs to travel along what equates to a hairpin turn around the sun at speeds measuring over 2 million miles (3 million km) per hour! —Joe Rao, Space.com, 5 Feb. 2026

Word History

First Known Use

Noun

1771, in the meaning defined at sense 1

Adjective

1887, in the meaning defined above

Kids Definition

hairpin

noun

hair·​pin

-ˌpin

1

: a U-shaped pin to hold the hair in place

2

: something shaped like a hairpin

especially : an extremely sharp turn in a road

hairpin adjective

Medical Definition

hairpin

noun

hair·​pin ˈha(ə)r-ˌpin, ˈhe(ə)r- 

variants also hairpin loop

: a region in single-stranded RNA or DNA that is double-stranded due to pairing between purine and pyrimidine bases in adjacent sequences of the RNA or DNA that are complementary and inverted