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Define mushroom. mushroom synonyms, mushroom pronunciation, mushroom translation, English dictionary definition of mushroom. n. 1. a. Any of various fungi that produce a fleshy fruiting body, especially one consisting of a stalk with an umbrella-shaped cap. b. Any of such fungi...
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  mushroom(noun) common name for an edible agaric (contrasting with the inedible toadstool) 2  mushroom(noun) mushrooms and related fleshy fungi (including toadstools, puffballs, morels, coral fungi, etc.)