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1.
PRN
Medical shorthand terminology for whenever necessary (pro re nata)which basically means its an excuse for the staff to be driven crazy prn.
"what the patient in 1408 really needs is a bath prn..god!"

"what smart jerk wrote the order for a hand job prn???"
by DaynaS February 17, 2008
 
2.
cyberspace euphemism for pornography

intended to foil automated site-blocking software
he spends most of his nights surfing pr()n
by BvO April 22, 2003