Meaning of MUSHROOM in English

[] n [alter. of ME musseroun, fr. MF mousseron, fr. LL mussirion-, mussirio] (1533) 1 a: an enlarged complex aboveground fleshy fruiting body of a fungus (as a basidiomycete) that consists typically of a stem bearing a pileus; esp: one that is edible b: fungus

2: upstart

3: something resembling a mushroom

[2]mushroom vi (1894) 1: to collect wild mushrooms

2. a: to well up and spread out laterally from a central source b: to become enlarged or extended: grow

3: to spring up suddenly or multiply rapidly

Merriam-Webster English vocab.      Английский словарь Merriam Webster.