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Frenkel defect
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frenulum

fren·u·lum [ frénnyələm ] (plural fren·u·la [ frénnyələ ])


noun 
Definition:
 
1. bristle on hind wing of moths: a small stiff bristle on the hind wing of moths that keeps the forewings and hind wings together during flight

2. small membrane: a small fold of skin or membrane that limits the movement of an organ, typically smaller than a frenum

[Early 18th century. < modern Latin, "small frenum" < Latin frenum (see frenum)]
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