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mushroom

MUSH-room/ˈmʌʃˌɹuːm/

Pluralmushrooms

Verbmushrooms, mushrooming, mushroomed

11 meanings of mushroom

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  1. 1
    nouncountable
    A fungus that grows from the ground or on wood, usually with a stem and a round cap. Some can be eaten.

    Like a tiny umbrella that pops up out of the ground.

    We found a wild mushroom growing near the old oak tree.

    She picked a basket of mushrooms after the heavy rain.

    Similarfungus, toadstool

  2. 2
    common cooking kindnouncountable
    The common white or brown kind of fungus sold in stores and used in cooking.

    I sliced a mushroom and put it on my pizza.

    He fried some mushrooms with garlic and butter.

  3. 3
    fungus-shapedadjectivebefore a noun
    Looking or acting like a mushroom, in shape, color, fast growth, or feel.

    The new building has a strange mushroom shape, wide on top and thin below.

    My little brother has a short, round mushroom haircut.

    UsagePut it before a noun: a mushroom cloud. For shape after a verb, say mushroom-shaped.

  4. 4
    expand quicklyverbfigurativelyintransitive
    To grow very fast and become much bigger, or to spread quickly.

    Like a balloon that gets big very fast when you blow into it.

    The small club mushroomed into a national movement.

    Costs can mushroom if you don't plan carefully.

    Similarboom, explode, burgeon, balloon, skyrocket

    Oppositeshrink, dwindle, decline

    Note

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Origin

It comes through Middle English and Old French, and probably goes back to a word for "moss," because the name first referred to a fungus that grows in moss.

Checked 31 Oct 2026 · 3 facts

  • The word comes through Middle English and Old French. en.wiktionary.org
  • The word probably ultimately derives from a word meaning moss. en.wikipedia.org
  • The proposed connection concerns the name first applying to a fungus that grows in moss, not where the fungus first grew. en.wiktionary.org