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English definition of “mushroom”

mushroom

noun [C] uk   /ˈmʌʃ.ruːm/ /-rʊm/ us  
A2 a fungus with a round top and short stem. Some types of mushroom can be eaten: wild/cultivated mushrooms button (= very small) mushrooms dried/grilled/stuffed/sliced mushrooms cream of mushroom soup For this recipe choose mushrooms with large caps (= top parts). Unfortunately some poisonous mushrooms look like edible mushrooms.
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mushroom

verb [I] uk   /ˈmʌʃ.ruːm/ /-rʊm/ us  
to increase very quickly: The number of computers in schools has mushroomed in recent years.
(Definition of mushroom from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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