Entomology A bristly construction on the hind wings of particular moths and butterflies that holds the forewings and hind wings together during flight.
A small fold of tissue that stops an organ within the body from going too much.
In physiology, same as frenum or frenula.
In lepidopterous pests, a strong, elastic, occasionally dual bristle in the upper side of the secondary wing, near its base. Additionally spelled frænulum.
How would you define frenulum?