Source : Webster's Revised Unabridged Dictionary (1913)

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}.

Source : WordNet®

frena
     See {frenum}