Dictionary

1mushroom

noun mush·room \ˈməsh-ˌrüm, -ˌrm; chiefly Northern & Midland -ˌrün; dial ˈmə-shə-ˌrüm, -ˌrm, -ˌrün\

: a fungus that is shaped like an umbrella; especially : one that can be eaten

Full Definition of MUSHROOM

1
a :  an enlarged complex aboveground fleshy fruiting body of a fungus (as a basidiomycete) that consists typically of a stem bearing a pileus; especially :  one that is edible
b :  fungus
2
:  upstart
3
:  something resembling a mushroom
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Examples of MUSHROOM

  1. cut up some mushrooms for the salad

Origin of MUSHROOM

Middle English musheron, from Anglo-French musherum, musseron, from Late Latin mussirion-, mussirio
First Known Use: 15th century

2mushroom

verb

: to increase or develop very quickly

: to collect wild mushrooms

Full Definition of MUSHROOM

intransitive verb
1
a :  to well up and spread out laterally from a central source
b :  to become enlarged or extended :  grow
2
:  to collect wild mushrooms
3
:  to spring up suddenly or multiply rapidly

Examples of MUSHROOM

  1. Interest in local history is suddenly mushrooming.
  2. Her hobby mushroomed into a thriving business.
  3. He goes mushrooming in the spring every year.

First Known Use of MUSHROOM

1893
MUSHROOM Defined for Kids

1mushroom

noun mush·room \ˈməsh-ˌrüm, -ˌrm\

Definition of MUSHROOM for Kids

:  a part of a fungus that bears spores, grows above ground, and suggests an umbrella in shape

2mushroom

verb
mush·roomedmush·room·ing

Definition of MUSHROOM for Kids

:  to appear or develop suddenly or increase rapidly <The town's population has mushroomed.>
Medical Dictionary

mushroom

noun mush·room \ˈməsh-ˌrüm, -ˌrm\

Medical Definition of MUSHROOM

1
:  an enlarged complex fleshy fruiting body of a fungus (as most basidiomycetes) that arises from an underground mycelium and consists typically of a stem bearing a spore-bearing structure; especially :  one that is edible—compare toadstool
2
:  fungus 1
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