noun, plural frena [free-nuh] . Anatomy, Zoology.
a fold of membrane that checks or restrains the motion of a part, as the fold on the underside of the tongue.
Also, fraenum.

< Neo-Latin; Latin frēnum bridle Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fraenum or frenum (ˈfriːnəm)
n , pl -na
a fold of membrane or skin, such as the fold beneath the tongue, that supports an organ
[C18: from Latin: bridle]
frenum or frenum (ˈfriːnəm, -nə)
[C18: from Latin: bridle]

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

frenum fre·num (frē'nəm)
n. pl. fre·nums or fre·na (-nə)

  1. 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.

  2. An anatomical structure resembling such a fold.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Individuals have a broad frenum on the upper lip and a small pointed head.
The premaxillary frenum is absent or poorly developed.
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