Did you know?

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

tartar - 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 tartar pronunciation in American English /ˈtɑrtər/
Word Forms
  1. 1
    [uncountable] a hard substance that forms on your teeth and can cause them to decay
    Synonyms and related words
  2. 2
    [countable] informal an unpleasant person who is often angry or violent, usually someone in a position of power


a title used before a man or woman's name as a gender-neutral alternative to Mr, Ms, etc

BuzzWord Article

Open Dictionary


another way of saying congratulations, or that something/someone looks nice or fascinating

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