MUSHROOM

I. noun Etymology: Middle English musheron, from Anglo-French musherum, musseron, from Late Latin mussirion-, mussirio Date: 15th century 1. an enlarged complex aboveground fleshy fruiting body of a fungus (as a basidiomycete) that consists typically of a stem bearing a pileus, fungus , upstart , something resembling a ~, II. intransitive verb Date: 1893 1. to well up and spread out laterally from a central source, to become enlarged or extended ; grow , to collect wild ~s, to spring up suddenly or multiply rapidly