A small anatomical structure that restrains or limits movement, such as the tissue beneath the tongue or similar structures elsewhere in the body.
From Latin frenulum, a diminutive form of frenum meaning 'bridle' or 'restraint,' referring to something that holds or controls movement like a horse's bridle does.
Every time you stick out your tongue, you're fighting against your frenulum—that little web of tissue underneath—and you're literally wrestling with a structure named after an ancient horse bridle, which perfectly captures what it does!
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