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  2  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Tartar  \Tar"tar\,  n.  [F.  tartre  (cf.  Pr  tartari,  Sp.,  Pg.,  & 
  It  tartaro,  LL  tartarum,  LGr.  ?);  perhaps  of  Arabic 
  1.  (Chem.)  A  reddish  crust  or  sediment  in  wine  casks, 
  consisting  essentially  of  crude  cream  of  tartar,  and  used 
  in  marking  pure  cream  of  tartar,  tartaric  acid,  potassium 
  carbonate,  black  flux,  etc.,  and  in  dyeing,  as  a  mordant 
  for  woolen  goods;  --  called  also  {argol},  {wine  stone}, 
  2.  A  correction  which  often  incrusts  the  teeth,  consisting  of 
  salivary  mucus,  animal  matter,  and  phosphate  of  lime. 
  {Cream  of  tartar}.  (Chem.)  See  under  {Cream}. 
  {Tartar  emetic}  (Med.  Chem.),  a  double  tartrate  of  potassium 
  and  basic  antimony.  It  is  a  poisonous  white  crystalline 
  substance  having  a  sweetish  metallic  taste,  and  used  in 
  medicine  as  a  sudorific  and  emetic. 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Argol  \Ar"gol\,  n.  [Cf.  {Argal},  {Orgal}.  Of  unknown  origin.] 
  Crude  tartar;  an  acidulous  salt  from  which  cream  of  tartar  is 
  prepared.  It  exists  in  the  juice  of  grapes,  and  is  deposited 
  from  wines  on  the  sides  of  the  casks.  --Ure.