mush·room (m sh r m , -r m)n. 1. Any of various fleshy fungi of the class Basidiomycota, characteristically having an umbrella-shaped cap borne on a stalk, especially any of the edible kinds, as those of the genus Agaricus. 2. Something shaped like one of these fungi. intr.v. mush·roomed, mush·room·ing, mush·rooms 1. To multiply, grow, or expand rapidly: The population mushroomed in the postwar decades. 2. To swell or spread out into a shape similar to a mushroom. adj. 1. Relating to, consisting of, or containing mushrooms: mushroom sauce. 2. Resembling mushrooms in rapidity of growth or evanescence: mushroom towns. [Alteration (influenced by room) of Middle English musheron, from Anglo-Norman moscheron, musherum, from Old French mousseron, from Medieval Latin musari  , musarin-.] |
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