per orum

== English == === Etymology === From per, borrowing from classical Latin per (“through”), and orum as incorrectly formed accusative of ōs (“mouth”). === Adverb === per orum (US, medicine) Alternative form of per orem per os; via the mouth; orally ==== Usage notes ==== The declined form is erroneous. Proper Latin would be per os. This (per orum) is an alternative form of per orem, itself an ungrammatical form of per os. === References ===