as needed; as the circumstances require

Word History

Etymology

Latin pro re nata

Dictionary Entries Near prn

Cite this Entry

“Prn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prn. Accessed 20 May. 2024.

Medical Definition

prn

abbreviation
as needed; as the circumstances require
used in writing prescriptions
Etymology

Latin pro re nata

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