Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “mushroom”


noun [C]     /ˈmʌʃruːm/
A2 a type of fungus (= organism like a plant) with a short stem and a round top, some types of which can be eaten: pasta with wild mushrooms mushroom pizza/soupBacteria, moulds, germs and virusesTypes of vegetablePlants in general
(Definition of mushroom noun from the Cambridge Learner's Dictionary © Cambridge University Press)

More Learner's Dictionary definitions for “mushroom”

Definitions of “mushroom” in other dictionaries

Word of the Day


the quality of knowing someone very well, liking them a lot, and wanting to spend a lot of time together

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More