vascellum

From vāsculum (“small vessel”) +‎ -lum (diminutive suffix).

vāscellum n (genitive vāscellī); second declension (Late Latin)

1. a small vase or urn [4th c. CE]^[1]

Second-declension noun (neuter).

From the plural vāscella, reinterpreted as a collective feminine singular noun:

• “vascellum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• "vascellum", 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)
• vascellum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.