Did you know?

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

poison - 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     poison pronunciation in American English
Word Forms
  1. 1
    [countable/uncountable] a substance that can kill you or make you sick if you eat, drink, or breathe it

    Some mushrooms contain poison.

    rat poison (=poison used for killing rats)

  2. 2
    [countable/uncountable] something that has a negative effect

    Capitalism is regarded as a poison that is destroying the traditional way of life.

    1. a.
      [uncountable] words or actions that express the feeling of hating someone

      The look she gave me was pure poison.

Open Dictionary

snap election

a general election … that is called earlier than expected

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