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frenum vs. frenulum

[ free-nuhm ]
  1. a fold of membrane that checks or restrains the motion of a part, as the fold on the underside of the tongue.
[ fren-yuh-luhm ]
  1. a small frenum.
  2. 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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