New American Oxford Dictionary
frenulum
fren u lum |ˈfrenyələm ˈfrɛnjələm | ▶noun Anatomy a small fold or ridge of tissue that supports or checks the motion of the part to which it is attached, in particular a fold of skin beneath the tongue, or between the lip and the gum. • Entomology (in some moths and butterflies ) a bristle or row of bristles on the edge of the hind wing that keeps it in contact with the forewing. ORIGIN early 18th cent.: modern Latin, diminutive of Latin frenum ‘bridle. ’
Oxford Dictionary
frenulum
frenulum |ˈfriːnjʊləm |(also fraenulum ) ▶noun 1 Anatomy a small fold or ridge of tissue which supports or checks the motion of the part to which it is attached, in particular a fold of skin beneath the tongue, or between the lip and the gum. 2 Entomology (in some moths and butterflies ) a bristle or row of bristles on the edge of the hindwing which keeps it in contact with the forewing. ORIGIN early 18th cent.: modern Latin, diminutive of Latin frenum ‘bridle ’.
Duden Dictionary
Frenulum
Fre nu lum Substantiv, Neutrum Anatomie , das |Fr e nulum |das Frenulum; Genitiv: des Frenulums, Plural: die Frenula Verkleinerungsform von lateinisch frenum = Band 1 kleine Haut- bzw. Schleimhautfalte 2 Hautfalte, die die Eichel des männlichen Gliedes mit der Vorhaut verbindet