ETYM Old Eng. muscheron, Old Fren. mouscheron, French mousseron; perhaps from mousse moss, of German origin. Related to Moss.
1. Fleshy body of any of numerous edible fungi.
2. Common name for an edible agaric fungus (contrasting with the inedible toadstool).
3. A large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb); SYN. mushroom cloud, mushroom-shaped cloud.
4. Any of various fleshy fungi of the subdivision Basidiomycota consisting of a cap at the end of a stem arising from an underground mycelium.
Fruiting body of certain fungi, consisting of an upright stem and a spore-producing cap with radiating gills on the undersurface. There are many edible species belonging to the genus Agaricus. See also fungus and toadstool.