My son asked a simple question: What does prn mean (he read his Rx for an allergy treatment after a recent doctors visit)?
"It means as needed," I said.
"What does the prn stand for?"
I couldn't remember, even though I also use it on many Rx's a day.
I looked it up.
It's Latin and stands for Pro Re Nata.
I took three years of Latin, years ago, in high school at my Mom's insistence.
She would not be pleased to know I had forgotten.
I never did have much of an aptitude for foreign languages, much less a dead language.