Definition of frenulum
1 : a connecting fold of membrane serving to support or restrain a part (as the tongue)
2 : a bristle or group of bristles on the front edge of the posterior wings of some lepidoptera that unites the wings by interlocking with a catch on the posterior part of the forewings
Origin and Etymology of frenulum
New Latin, diminutive of Latin frenum
First Known Use: circa 1706
Seen and Heard
What made you want to look up frenulum? Please tell us where you read or heard it (including the quote, if possible).