noun, plural frenula [fren-yuh-luh] .
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.
Also, fraenulum.

1890–95; < Neo-Latin; see frenum, -ule

frenular, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frenulum (ˈfrɛnjʊləm)
n , pl -la
1.  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
2.  a small fraenum
[C18: New Latin, diminutive of Latin frēnum bridle]

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American Heritage
Medical Dictionary

frenulum fren·u·lum (frěn'yə-ləm)
n. pl. fren·u·la (-lə)
A small frenum or band of fibrous material.

The American Heritage® Stedman's Medical Dictionary
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