'Toadstool' definitions:

Definition of 'toadstool'

From: WordNet
noun
Common name for an inedible or poisonous agaric (contrasting with the edible mushroom) [ant: mushroom]

Definition of 'Toadstool'

From: GCIDE
  • Toadstool \Toad"stool`\, n. (Bot.) A name given to many umbrella-shaped fungi, mostly of the genus Agaricus. The species are almost numberless. They grow on decaying organic matter. [1913 Webster]