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| a soft, fatty, vascular tissue in the interior cavities of bones that is a major site of blood cell production |
| one of the hollow cavities in the skull connecting with the nasal cavities |
| frenum (ˈfriːnəm) | |
| —n , pl -na | |
| a variant spelling (esp US) of fraenum | |
frenum 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 connecting the tongue to the floor of the mouth.
An anatomical structure resembling such a fold.