Webster's English Dictionary

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mildew

1. mil.dew \'mil-.d(y)u:\ \-e-\ n [ME, fr. OE melede-aw; akin to OHG 
   militou honeydew] 1a: a superficial usu. whitish growth produced on organic 
   matter or living  plants by fungi (as of the families Erysiphaceae and 
   Peronosporaceae) 1b: a fungus producing mildew  2: a discoloration caused 
   by fungi  - mil.dewy aj
2. mildew vt : to affect with mildew to become affected with mildew