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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Bismuthyl  \Bis"muth*yl`\,  n.  (Min.) 
  Hydrous  carbonate  of  bismuth,  an  earthy  mineral  of  a  dull 
  white  or  yellowish  color.  [Written  also  {bismuthite}.]