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Synonyms
mush·room (mŭsh́rōōḿ, -rŏŏḿ)

[Alteration (influenced by room), of Middle English musheron, from Anglo-Norman moscheron, musherum, from Old French mousseron, from Medieval Latin musariō, musariōn-.]

noun 

  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.

intransitive verb: -roomed, -room·ing, -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.

adjective 

  1. Relating to, consisting of, or containing mushrooms: mushroom sauce.
  2. Resembling mushrooms in rapidity of growth or evanescence: mushroom towns.