- Anatomy, Zoology. a small frenum.
- Entomology. a strong spine or group of bristles on the hind wing of many butterflies and moths, projecting beneath the forewing and serving to hold the two wings together in flight.
Origin of frenulum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for frenulum
Several of the families in this group have lost the frenulum.
Connected with this organ is a small tough membrane or ligament called the frenum which corresponds to the frenulum of the male.Self Knowledge and Guide to Sex Instruction
T. W. Shannon
In butterflies there is no frenulum, but a costal outgrowth of the 466 hindwing subserves the same function.
The Lasiocampidae, together with a few small families, differ from the majority of this group in wanting a frenulum.
The maxillae are well developed, the hindwing has a frenulum, and its sub-costal nervure touches the radial near the base.
- a strong bristle or group of bristles on the hind wing of some moths and other insects, by which the forewing and hind wing are united during flight
- a small fraenum
C18: New Latin, diminutive of Latin frēnum bridle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- A small frenum or band of fibrous material.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.