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 membraneserving to support or restrain
any part; as, the fr[ae]num of the tongue.
[1913 Webster]
The Collaborative International Dictionary of English.
2000.