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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Fraenum  \Fr[ae]"num\,  or  Frenum  \Fre"num\,  n.;  pl  E. 
  {Fr[ae]nums},  L.  {Fr[ae]na}.  [L.,  a  bridle.]  (Anat.) 
  A  connecting  fold  of  membrane  serving  to  support  or  restrain 
  any  part  as  the  fr[ae]num  of  the  tongue.