Per os (P.O.) is an adverbial phrase meaning literally from Latin "by mouth" or "by way of the mouth." The expression is used in medicine to describe a treatment that is taken orally. The abbreviated P.O. is often used on medical prescriptions.
P.O. is also occasionally (and grammatically incorrectly; os is a neuter noun of the 3rd declension and thus the accusative is the same as the nominative) rendered per orem, which is sometimes corrupted to per oram.
Pronunciation
- British: pər'əoυs
- U.S.: pər'oυs
See also
- Nil per os
- List of Latin phrases
- Medical prescription
- List of abbreviations used in medical prescriptions
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