mushroom

The word “mushroom” means the fleshy, umbrella-shaped fruiting body of certain fungi, often eaten as food. In plain terms, the fungus you eat, the shape it makes, or (as a verb) growing rapidly out of nowhere.

“Mushroom” is pronounced MUHSH-room (/ˈmʌʃˌɹum/ in IPA).

Here is “mushroom” used in a sentence: “She fried the mushrooms in butter and garlic before adding them to the pasta.”

Depending on how it is used, “mushroom” can be a noun, a verb and an adjective.

The word “mushroom” comes from Old French. From Middle English muscheron, borrowed via Old French from a word related to moss — because these fungi were first noticed growing among moss.

“Mushroom” is an uncommon word in modern English, usually learned at around the A2 level.

“Mushroom” has 3 distinct senses listed in this dictionary. The most common is: the fleshy, umbrella-shaped fruiting body of certain fungi, often eaten as food.

Both terms refer to the fleshy, umbrella-shaped fruiting body of certain fungi, but in everyday use "toadstool" is often reserved for varieties assumed to be poisonous while "mushroom" is used more generally, including edible kinds. The distinction is not scientific, since fungi taxonomy does not separate the two terms cleanly.

When used as a verb, "mushroom" means to grow or increase very quickly in size, number, or scale, much like how a mushroom's cap can appear to expand rapidly overnight. It is commonly applied to costs, populations, or problems that expand unexpectedly fast.

As an adjective, "mushroom" describes something shaped like a mushroom, meaning it has a wide cap on a narrower stem, as in a "mushroom cloud." This usage draws directly on the distinctive shape of the fungus.