from the GNU version of the Collaborative International Dictionary of English

  • prep. for the existing occasion; as matters are.

from The Century Dictionary and Cyclopedia

  • For some contingency that arises unexpectedly or out of due course.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adv. according to need (physicians use PRN in writing prescriptions)


Sorry, no etymologies found.


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  • Rx abbreviation prn = as needed.

    February 18, 2009

  • "It was formerly left to the crown to summon, pro re nata, the most flourishing towns to send representatives to parliament." - Blackstone, 1765.

    December 19, 2007