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p.o.

1.
(in prescriptions) by mouth.
Origin of p.o.
From the Latin word per ōs

P.O.

1.
parole officer.
2.
petty officer.
3.
postal (money) order.
4.
post office.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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