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The Collaborative International Dictionary
Fraenula

Fraenulum \Fr[ae]n"u*lum\, n.; pl. Fr[ae]nula. [NL., dim. of L. fraenum a bridle.] (Anat.) A fr[ae]num.

Wiktionary
fraenula

alt. (plural of fraenulum English) n. (plural of fraenulum English)