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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Carboxyl  \Car*box"yl\,  n.  [Carbon  +  oxygen  +  -yl.]  (Chem.) 
  The  complex  radical,  {CO.OH},  regarded  as  the  essential  and 
  characteristic  constituent  which  all  oxygen  acids  of  carbon 
  (as  formic,  acetic,  benzoic  acids,  etc.)  have  in  common;  -- 
  called  also  {oxatyl}.