Did you know?

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

iron - 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.



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 iron pronunciation in British English /ˈaɪə(r)n/
Word Forms
  • Facebook
  • Twitter
  1. 1
    [uncountable] a hard heavy metal that is a common element. It is used for making steel and is also used in many types of machine and building structures.
    1. a.
  2. 3
    [countable] a golf club with a metal end for hitting the ball
    Synonyms and related words
  3. 4


    [plural] mainly literary chains fitted round the arms or legs of prisoners to prevent them from escaping
  4. From our crowdsourced Open Dictionary
    a gun, or other weaponSubmitted from United Kingdom on 22/05/2013

sea lion

in an online conversation, repeatedly asking a person questions which suggest that you are interested in what they are talking about, but are actually intended to annoy them

BuzzWord Article

Open Dictionary


an electric skateboard

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