duplum - Wiktionary, the free dictionary

duplum

1. inflection of duplus:
   1. nominative/accusative/vocative neuter singular
   2. accusative masculine singular

• duplum in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)