orificium

From ōs (“mouth”) +‎ faciō (“I make”) +‎ -ium.

ōrificium n (genitive ōrificiī or ōrificī); second declension

1. (Late Latin) opening, orifice

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).

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