prn

abbreviation

Definition of prn

as needed; as the circumstances require

Origin and Etymology of prn

Latin pro re nata


Medical Dictionary

prn

abbreviation

medical Definition of prn

as needed; as the circumstances require used in writing prescriptions

Origin and Etymology of prn

Latin pro re nata


Seen and Heard

What made you want to look up prn? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to praise usually to excess

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!