fsgl wrote on Monday, April 07, 2014:
Could have sworn that we were taught “per oris” in medical school.
The preposition “per” takes the accusative not the ablative; therefore “oris” which is singular, genitive for the third declension makes no sense. Must not have been paying attention that day, many moons ago.
Not really a biggie because everyone, on either side of the rx pad, knows the meaning of “p.o.”. Just make the change in Lists, as suggested above, and all will be right with the world.