fre·num (fr  n m)n. pl. fre·nums or fre·na (-n ) 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 fr num, bridle, from frendere, to grind; see ghrendh- in Indo-European roots.] |
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