from Wiktionary, Creative Commons Attribution/Share-Alike License

  • abbr. As the situation may require, such as in directions on medical charts by doctors for the benefit of nursing staff indicating actions that may be taken at their discretion depending on patient condition; or likewise instructions to a patient on a prescription indicating they may take the medicine if and when they feel the need for it


From Latin phrase pro re nata, "for the birth of a thing". (Wiktionary)



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