from The Century Dictionary and Cyclopedia
- In entomology, provided with a frenulum: applied to the posterior wings of a lepidopterous insect, when they are provided with a bristle by which they can be attached to the anterior wings.
Sorry, no etymologies found.
Frenulum: the spine, simple in males, compound in females, arising from the base of secondaries in many Lepidoptera, whose function it is to unite the wings in flight: in Cicada the triangular lateral piece on the mesonotum which connects with the trochlea: the anal area of secondaries and thus = tendo, q.v. Frenulum hook: in the males of frenate Lepidoptera, a hook or fold into which the frenulum is fitted.