fre·num (frēnəm)
n. pl. fre·nums or fre·na (-nə)
A membranous fold of skin or mucous membrane that supports or restricts the movement of a part or organ, such as the small band of tissue that connects the underside of the tongue to the floor of the mouth.

[TahlilGaran] American Dictionary ▲

frenum
[Latin frēnum, bridle, from frendere, to grind. See ghrendh- in Indo-European Roots.]

[TahlilGaran] American Dictionary ▲