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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Ferrugo  \Fer*ru"go\,  n.  [L.,  iron  rust,  fr  ferrum  iron.] 
  A  disease  of  plants  caused  by  fungi,  commonly  called  the 
  {rust},  from  its  resemblance  to  iron  rust  in  color.