Etymology of the English word orifice
the English word orifice
derived from the Late Latin word orificium (opening; opening; orifice)
derived from the Latin word os (oris, mouth; bone; bones; mouth, speech, expression)
derived from the Proto-Indo-European root *os-
derived from the Proto-Indo-European root *ost-
derived from the Proto-Indo-European root *ōs-
using the Latin suffix -ficium