Date: Thu Feb 5 00:05:15 EST 1998
Subject: A.Word.A.Day--frenum
fre.num n. [L. Fraena. [L., a bridle.]] A connecting fold of membrane serving to support or restrain any part; as, the frenum of the tongue.

Porter, Roy, Knotted Tongues: Stuttering in History and the Quest for a Cure. Vol. 212,The New Republic, 06-12-1995, pp 42(5). "His operation consisted of making a horizontal section at the root of the tongue, and excising a triangular wedge so that the impulses could get through--a far more drastic operation than dividing the frenum."

There is another frenum, even more often troublesome, the attachment of the prepuce to the glans penis.