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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Mesityl  \Mes"i*tyl\,  n.  (Chem.) 
  A  hypothetical  radical  formerly  supposed  to  exist  in  mesityl 
  {Mesityl  oxide}  (Chem.),  a  volatile  liquid  having  the  odor  of 
  peppermint,  obtained  by  certain  dehydrating  agents  from 
  acetone;  --  formerly  called  also  {dumasin}.