mush·​room | \ ˈməsh-ˌrüm How to pronounce mushroom (audio) , -ˌru̇m; chiefly Northern and Midland US -ˌrün; dialectal ˈmə-shə-ˌrüm, -ˌru̇m, -ˌrün \

Definition of mushroom

 (Entry 1 of 2)

1a : an enlarged complex aboveground fleshy fruiting body of a fungus (such 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


mushroomed; mushrooming; mushrooms

Definition of mushroom (Entry 2 of 2)

intransitive verb

1a : 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 in a Sentence

Noun cut up some mushrooms for the salad Verb Interest in local history is suddenly mushrooming. Her hobby mushroomed into a thriving business. He goes mushrooming in the spring every year.
Recent Examples on the Web: Noun Think crispy grilled chicken with lemon and thyme; the Ultimate Veggie Burgers made with a mushroom, barley, and black bean patty on squishy sesame seed buns; and spice-forward lamb kebabs with a garlicky yogurt sauce. Joe Sevier, Bon Appétit, 6 May 2022 Color choices include cream, mushroom, and a steely blue-gray, all with legs finished in dark brown. Rachel Klein, Popular Mechanics, 30 Apr. 2022 This twice-a-day treatment for your face has an anti-aging trifecta: vitamin A, chaga mushroom, and hyaluronic acid. ELLE, 28 Apr. 2022 Morels grown in nature often carry dirt, bugs and slugs, but washing off the junk means wetting the mushroom, which degrades its texture. New York Times, 26 Apr. 2022 Here, tender chicken thighs get smothered in a rich mushroom gravy. Michael Russell, oregonlive, 24 Dec. 2021 Explaining any office’s dynamics to an outsider is impossible in the same way that explaining a dream or a mushroom trip is. Ellen Cushing, The Atlantic, 12 Oct. 2021 Adidas isn’t alone in turning out mushroom leather concept products. Demetrius Simms, Robb Report, 19 Apr. 2021 Some fashion designers are also experimenting with mushroom leather. New York Times, 7 Feb. 2021 Recent Examples on the Web: Verb At the moment of full vehicle autonomy, the amount of connectivity within a vehicle should mushroom out, considering the driver is now free to be connected. Patrick Moorhead, Forbes, 17 Mar. 2022 Tesla’s revenues would need to mushroom from $47 billion over the past four quarters, to $783 billion in 2030. Shawn Tully, Fortune, 30 Nov. 2021 The cost of business subscriptions and data services can quickly and easily mushroom unless carefully managed. Expert Panel®, Forbes, 25 Jan. 2022 Workhuman’s artificial intelligence work around of language in an employee recognition system show that unintentional bias, which is human nature, can create problems that mushroom over time. Eric Mosley, Forbes, 20 Jan. 2022 Bakkt projects that by 2025, the total pool of rewards will mushroom from today’s $1.6 trillion to $5.0 trillion, for an annual growth rate of 25%. Shawn Tully, Fortune, 18 Oct. 2021 Public shaming and individual harassment would mushroom. Steve Forbes, Forbes, 28 Oct. 2021 If our borrowings indeed mushroom to $44 trillion, the total bill would come to $1.113 trillion. Shawn Tully, Fortune, 6 Oct. 2021 The industry's electricity consumption would mushroom from 117 TWh to 206 TWh. Shawn Tully, Fortune, 26 Sep. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mushroom.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of mushroom


15th century, in the meaning defined at sense 1a


1893, in the meaning defined at sense 1a

History and Etymology for mushroom


Middle English musheron, from Anglo-French musherum, musseron, from Late Latin mussirion-, mussirio

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Time Traveler for mushroom

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The first known use of mushroom was in the 15th century

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Dictionary Entries Near mushroom



mushroom anchor

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Last Updated

16 May 2022

Cite this Entry

“Mushroom.” Dictionary, Merriam-Webster, Accessed 23 May. 2022.

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More Definitions for mushroom


mush·​room | \ ˈməsh-ˌrüm How to pronounce mushroom (audio) , -ˌru̇m \

Kids Definition of mushroom

 (Entry 1 of 2)

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


mushroomed; mushrooming

Kids Definition of mushroom (Entry 2 of 2)

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


mush·​room | \ ˈməsh-ˌrüm How to pronounce mushroom (audio) , -ˌru̇m How to pronounce mushroom (audio) \

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

More from Merriam-Webster on mushroom

Nglish: Translation of mushroom for Spanish Speakers

Britannica English: Translation of mushroom for Arabic Speakers Encyclopedia article about mushroom


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