Definition of prn

as needed; as the circumstances require

History and Etymology for prn

Latin pro re nata

Keep scrolling for more

Keep scrolling for more

More Definitions for prn

Medical Definition of prn

as needed; as the circumstances require used in writing prescriptions

History and Etymology for prn

Latin pro re nata

Comments on prn

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

WORD OF THE DAY

to affect and impair by alcohol or a drug

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
True or False

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

TAKE THE QUIZ
Word Winder's CrossWinder

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!