frenum

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fre·num

 (frē′nəm)
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.

[Latin frēnum, bridle, from frendere, to grind; see ghrendh- in the Appendix of Indo-European roots.]

frenum

(ˈfriːnəm)
n, pl -na (-nə)
(Anatomy) a variant spelling (esp US) of fraenum

fre•num

(ˈfri nəm)

n., pl. -na (-nə)
a fold of membrane, as on the underside of the tongue, that checks or restrains motion.
[1740–50 < New Latin; Latin frēnum bridle]