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.
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- Also fraenulum.
- fren·u·lar, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use frenulum in a sentence
A deficient or excessive development of the lingual frenulum may also interfere with the movements of the tongue (tongue-tie).Pedagogical Anthropology | Maria Montessori
Several of the families in this group have lost the frenulum.
If due to a tight frenulum, this requires the attention of a doctor.Self Knowledge and Guide to Sex Instruction | T. W. Shannon
This process is termed the retinaculum, and serves, in conjunction with the frenulum, to lock the wings together during flight.New Zealand Moths and Butterflies | G. V. Hudson
In many of the Lepidoptera both frenulum and retinaculum are entirely wanting.New Zealand Moths and Butterflies | G. V. Hudson
British Dictionary definitions for frenulum
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
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