[ muhsh-room, -roo m ]
/ ˈmʌʃ rum, -rʊm /



verb (used without object)

Origin of mushroom

1350–1400; alteration (by folk etymology) of Middle English muscheron, musseroun < Middle French mousseron ≪ Late Latin mussiriōn-, stem of mussiriō


mush·room·like, adjective mush·room·y, adjective

Example sentences from the Web for mushroom

British Dictionary definitions for mushroom

/ (ˈmʌʃruːm, -rʊm) /


  1. the fleshy spore-producing body of any of various basidiomycetous fungi, typically consisting of a cap (pileus) at the end of a stem arising from an underground mycelium. Some species, such as the field mushroom, are edibleCompare pileus, toadstool
  2. (as modifier)mushroom soup
the fungus producing any of these structures
  1. something resembling a mushroom in shape or rapid growth
  2. (as modifier)mushroom expansion

verb (intr)

to grow rapidly demand mushroomed overnight
to assume a mushroom-like shape
to gather mushrooms

Word Origin for mushroom

C15: from Old French mousseron, from Late Latin mussiriō, of obscure origin

Scientific definitions for mushroom

[ mŭshrōōm′ ]

Any of various fungi that produce a fleshy fruiting body, which usually consists of a stalk topped by an umbrella-shaped cap. Many mushrooms are basidiomycetes. Some species of mushrooms are edible, though many are poisonous. The term mushroom is often applied to the stalk and cap alone. See more at basidiomycete.