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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Betaine  \Be"ta*ine\,  n.  [From  beta,  generic  name  of  the  beet.] 
  A  nitrogenous  base,  {C5H11NO2},  produced  artificially,  and 
  also  occurring  naturally  in  beet-root  molasses  and  its 
  residues,  from  which  it  is  extracted  as  a  white  crystalline 
  substance;  --  called  also  {lycine}  and  {oxyneurine}.  It  has  a 
  sweetish  taste.