any of various mushrooms having a stalk with an umbrellalike cap, especially the agarics.
a poisonous mushroom, as distinguished from an edible one.
any of various other fleshy fungi, as the puffballs and coral fungi.

1350–1400; Middle English tadstol. See toad, stool Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
toadstool (ˈtəʊdˌstuːl)
(not in technical use) Compare mushroom any basidiomycetous fungus with a capped spore-producing body that is not edible
[C14: from toad + stool]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., apparently a fanciful name from M.E. tadde "toad" + stole "stool." Toads themselves were regarded as very poisonous, and this word is popularly restricted to inedible or poisonous fungi, as opposed to mushrooms (e.g. toad-cheese, a poisonous fungi).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


any of various inedible or poisonous species of mushrooms (kingdom Fungi). See mushroom.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They are all probably linked to the use of a hallucinogenic toadstool in ancient rituals.
More highly-evolved fungi, such as the toadstool-shaped mushrooms, have caps.
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