Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ōrĭfĭcĭum, ii, n. [1. os-facio], an opening, orifice (post-class.): ventris sunt duo orificia, Macr. S. 7, 4: cistulae, App. M. 9, p. 236, 41; 11, p. 262, 27.