What does frenulum mean?
A frenulum is a small fold of membrane or connective tissue that tethers one part of the body to another, restricting or guiding movement. The word comes from Latin frenulum, literally a 'little bridle' — a fitting image, since these bands act like reins on the structures they restrain. In human anatomy there are several: the lingual frenulum beneath the tongue, whose abnormal shortness causes the condition known as tongue-tie; the labial frenula joining lips to gums; and the penile frenulum on the underside of the glans. Because the term belongs chiefly to medicine, dentistry, and speech therapy, it carries a clinical register and appears rarely outside those settings. It remains useful to know, however, since procedures that release or trim a frenulum — frenotomy and frenectomy — are common in infants with feeding difficulties and are increasingly discussed in parenting and health circles.
nounA small fold of membrane or skin that anchors or restrains an organ or body part, such as the fold beneath the tongue or connecting the foreskin to the glans.
- Anatomy generally: a small fold of tissue that limits or anchors the movement of an organ or part.
- Specifically, the lingual frenulum: the fold beneath the tongue, whose tightness causes tongue-tie.
- Specifically, the penile frenulum: the elastic band of tissue on the underside attaching the foreskin to the glans.
"The infant's tight lingual frenulum was restricting tongue movement, so the pediatrician recommended evaluation for tongue-tie."
"An unusually short frenulum under the tongue can make it hard for a newborn to latch during breastfeeding."
"The dentist noted that her labial frenulum, the fold joining the upper lip to the gum, extended unusually low."
The Latin plural 'frenula' is standard in medical literature; the anglicized 'frenulums' is acceptable in general contexts.
"The oral exam noted unusually prominent labial frenula in both the upper and lower lips."
When a baby can't stick out their tongue, a tiny band called the frenulum is often the culprit — and a quick snip can fix it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does frenulum come from?
The word frenulum comes directly from Latin, where frenulum was the diminutive of frenum, meaning a bridle or curb for a horse — hence 'little bridle'. Latin anatomical writers applied the term metaphorically to the small bands of tissue that 'rein in' organs, and this usage passed into post-classical and modern anatomy. The same Latin root gave rise to the broader anatomical term frenum, and through Old French it contributed to the English verb 'refrain', which originally meant to curb or hold back, as one would a horse.
Related word forms
How frenulum is actually used
Frenulum is a technical term used almost exclusively in medical, dental, and speech-therapy contexts rather than everyday conversation. The plural is usually the Latin 'frenula', though anglicized 'frenulums' also appears. In popular usage the term most often surfaces in discussions of tongue-tie in infants or of minor surgical procedures.
Easily confused with frenulum
Frenum is the broader anatomical term for any restraining band of tissue, while frenulum specifically denotes one of these small membranous folds.
Despite the similar spelling, 'frenetic' means frantic or wildly energetic and derives from the Greek root for the mind, whereas 'frenulum' is an anatomical structure from the Latin for bridle.