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2017 Word of the Year

p.r.n.

1.
(in prescriptions) as the occasion arises; as needed.
Origin of p.r.n.
From the Latin word prō rē nāta
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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p.r.n. in Medicine

p.r.n. or PRN
abbr.
Latin pro re nata (as the situation demands)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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