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English definition of “mushroom”

mushroom

noun [C]     /ˈmʌʃ.ruːm/ /-rʊm/
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. → Compare toadstoolBacteria, moulds, germs and viruses
(Definition of mushroom noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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