Webster's English Dictionary

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mushroom

1. mush.room \'m*sh-.ru:m, -.ru.m\ n [ME musseroun, fr. MF mousseron, fr. 
   LL mussirion-, mussir] often attrib io 1a: an enlarged complex aerial 
   fleshy fruiting body of a fungus (as of the  class Basidiomycetes) that 
   consists typically of a stem bearing a flattened cap; esp : one that is 
   edible 1b: FUNGUS  archaic  2: UPSTART  3: something resembling a mushroom 
2. mushroom vi 1: to spring up suddenly or multiply rapidly  of a bullet  
   2a: to flatten at the end at impact  2b: to well up and spread out 
   laterally from a central source