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mould [2] ,  (U.S.) mold 
  n 
1 a coating or discoloration caused by various saprotrophic fungi that develop in a damp atmosphere on the surface of stored food, fabrics, wallpaper, etc. 
2 any of the fungi that causes this growth 
  vb 
3 to become or cause to become covered with this growth, (Also called)  mildew 
  (C15: dialect (Northern English) mowlde mouldy, from the past participle of moulen to become mouldy, probably of Scandinavian origin; compare Old Norse mugla mould)