Definition of toadstool noun from the Oxford Advanced Learner's Dictionary

 

toadstool

 noun
noun
BrE BrE//ˈtəʊdstuːl//
 
; NAmE NAmE//ˈtoʊdstuːl//
 
 
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a fungus with a round flat or curved head and a short stem. Many types of toadstool are poisonous. compare mushroom Word Origin late Middle English: a fanciful name.
See the Oxford Advanced American Dictionary entry: toadstool