fraenum noun. ['fri:nǝm] Also frenum. Pl. -na [-nǝ]. M18.
[Latin = bridle.]
Anatomy. A ligament or membranous fold serving to check the motion of the part to which it is attached, esp. any of those underneath the tongue.
ovigerous fraenum in some cirripedes, a fold of the mantle to which the fertilized egg-masses are attached.

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