Source : Webster's Revised Unabridged Dictionary (1913)

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.

Frenum \Fre"num\, n.; pl. E. {Frenums}, L. {Frena}. [L., a
   bridle.]
   1. (Zo["o]l.) A cheek stripe of color.

   2. (Anat.) Same as {Fr[ae]num}.