What does ducissa mean in Latin?

ducissa, a noun, means “a duchess, the wife of a duke”.

What is the genitive of ducissa?

The genitive singular is ducissae. ducissa is feminine, first declension.

In classical Latin, [dʊˈkɪs.sa]; in ecclesiastical (church) Latin, [duˈt͡ʃis.sa].

noun · femininefirst declension

ducissa f (genitive ducissae)

Classical[dʊˈkɪs.sa]Ecclesiastical[duˈt͡ʃis.sa]

Medieval Latinfemininea duchess, the wife of a duke
DUCISSA, Ducis uxor, apud Rymerum tom. 5. pag. 616. col. 1. Ludewig. Reliq. MS. tom. 5. pag. 501. etc.[1883–1887, Carolus Du Fresne dominus Du Cange, D. P. Carpenterius, [J. C.] Adelung(ius), G. A. L. Henschel, Léopold Favre, Glossarium mediæ et infimæ latinitatis. Editio nova, volume 3, Niort: L. Favre, imprimeur-éditeur, page 202a [i.e. page 202, first of three columns]:

From dux + -issa.