O / ōrĭfĭcĭum
noun

ōrĭfĭcĭum

gen. ōrĭfĭcii · gender neuter · decl. 2nd
1. os-facio
an opening; orifice
an opening, orifice (post-class.): ventris sunt duo orificia, Macr. S. 7, 4: cistulae, App. M. 9, p. 236, 41; 11, p. 262, 27.