frenulum
noun
fren·u·lum
ˈfren-yə-ləm
plural frenula
ˈfren-yə-lə
1
: a connecting fold of membrane serving to support or restrain a part (such as the tongue)
2
: a bristle or group of bristles on the front edge of the posterior wings of some lepidoptera that unites the wings by interlocking with a catch on the posterior part of the forewings
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Merriam-Webster unabridged
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