Etymology
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toadstool (n.)

late 14c., apparently just what it looks like: a fanciful name from Middle English tadde "toad" (see toad) + stole "stool" (see stool). Toads themselves were regarded as highly poisonous, and this word is "popularly restricted to poisonous or inedible fungi, as distinct from edible "mushrooms" [OED]. Compare toad-cheese, a poisonous fungi; toad's meat (1886), a "rustic" term for toadstool.

updated on February 10, 2014

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Definitions of toadstool from WordNet

toadstool (n.)
common name for an inedible or poisonous agaric (contrasting with the edible mushroom);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near toadstool

TNT

to

to-

toad

toadstone

toadstool

toady

toast

toaster

toasty

tobacco