p.o.
(in prescriptions) by mouth.
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Origin of p.o.
From the Latin word per ōs
Definition for p.o. (2 of 2)
P.O.
parole officer.
petty officer.
postal (money) order.
post office.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020