frenulum
/ˈfrenjʊləm/(亦作fraenulum)
noun
1- Anatomy a small fold or ridge of tissue which supports or checks the motion of the part to which it is attached, in particular a fold of skin beneath the tongue, or between the lip and the gum【剖】系带。
1.1
- Entomology (in some moths and butterflies) a bristle or row of bristles on the edge of the hindwing which keeps it in contact with the forewing【昆】（一些蛾和蝴蝶的）翅缰。
词源
early 18th cent.: modern Latin, diminutive of Latin frenum 'bridle'.