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p.r.n.

abbreviation for

  1. (in prescriptions) as the occasion arises; as needed.

prn

abbreviation for

  1. pro re nata
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of p.r.n.1

From Latin prō rē nāta
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Word History and Origins

Origin of p.r.n.1

Latin: as the situation demands; whenever needed

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PRMpro

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