English Reference

Word

nit

US/ˈnɪt/

UK/nˈɪt/

Definitions

01egg of a louse

B2

n. the tiny egg of a head louse, usually found attached to human hair.

n. the egg of a parasitic louse, particularly the head louse, typically cemented to a hair shaft.

“The school sent a letter home after one student was found to have nits.”

“The nurse conducted a thorough inspection of the children's hair to ensure no nits remained after the initial treatment.”

Synonyms

egg

02a minor mistake

C1

n. a very small, unimportant detail or mistake that someone complains about.

n. a trivial detail or minor shortcoming, typically the subject of pedantic criticism or nitpicking.

“The report was excellent, though the editor found a few nits in the formatting.”

“While the overall strategy was sound, the board spent hours arguing over minor nits that had no impact on the final outcome.”

Informal

Synonyms

quibblefaultflaw

03a foolish person

C1

n. a person who is silly or not very smart.

n. a fool or a simpleton; a shortened form of nitwit.

“Don't be such a nit; you know that's not how the machine works.”

“He felt like a complete nit after realizing he had been holding the map upside down for the last three miles.”

British English · Informal

Synonyms

foolnitwitidiot

04unit of brightness

C2 · Science

n. a unit used to measure how bright a screen or light is.

n. a unit of measurement for luminance, equivalent to one candela per square metre.

“The new smartphone screen can reach a peak brightness of two thousand nits.”

“Engineers increased the display's output to five hundred nits to ensure legibility even under direct sunlight.”

Technical

Synonyms

luminance

05cautious player

C1 · Sport

n. a player who is very careful and only takes risks when they have a perfect hand.

n. a player characterized by an exceptionally cautious, tight, and reactive style, often avoiding risks unless they hold a significant advantage.

“He is such a nit that he folded his cards even though he had a good hand.”

“The professional exploited the nit at the table by frequently bluffing, knowing the cautious player would only call with the absolute nuts.”

Slang

Synonyms

tight player

Antonyms

Real-World Examples

“These phones are perfectly legible in bright outdoor light, even the Pixel 11 that remained at 3,000 nits.”
Ars Technica · 19 Aug 2026

Etymology

From Middle English nite, from Old English hnitu, from Proto-Germanic hnits (compare Dutch neet, German Nisse, Norwegian nit), from Proto-Indo-European -níd- (compare Scottish Gaelic sneadh, Lithuanian gli̇̀nda, Polish gnida, Albanian thëri, Ancient Greek κονίς (konís)).

From Latin nitēre (“to shine”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domain

Education

This entry

Level
C1 · Advanced
Frequency
Occasional
Updated

Scan code

englishreference.com/q/nit

English Reference