Did you know?

Click any word in a definition or example to find the entry for that word

hair - definition and synonyms

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

noun     hair pronunciation in British English
Word Forms
  1. 1
    [uncountable] the mass of thin fibres that grows on your head

    long black hair

    He wore his hair in a ponytail.

    You need to brush your hair before you go out.

    1. a.
      [uncountable] hair that grows on other parts of the body

      facial/body hair

    2. b.
      [uncountable] the hair that grows from an animal’s skin
  2. From our crowdsourced Open Dictionary
    somebody's hair is on fire somebody is extremely excited or agitated

    The only people whose hair wasn't on fire over the sacking of the FBI director were in the press office of the White House.

    Submitted by Boris Marchenko from Russian Federation on 11/05/2017
See also


to manipulate someone psychologically so that they begin to question their own perceptions and memories

BuzzWord Article

Open Dictionary

Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play