Definition of mushroom noun from the Oxford Advanced American Dictionary

 

mushroom

 noun
noun
NAmE//ˈmʌʃrum//
 
, NAmE//ˈmʌʃrʊm//
 
 
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a fungus with a round flat head and short stem. Many mushrooms can be eaten fried mushrooms cream of mushroom soup see also button mushroom, toadstool
See the Oxford Advanced Learner's Dictionary entry: mushroom