Did you know?

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

CAT scan - 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 [countable] medical CAT scan pronunciation in British English /ˈkæt ˌskæn/
Word Forms
singularCAT scan
pluralCAT scans

or CT scan CAT scan pronunciation in British English /ˌsiː ˈtiː ˌskæn/

  1. a medical test in which computer technology is used for producing an image of the inside of a part of your body, or the image that is produced in this way


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