1. According to need (physicians use PRN in writing prescriptions)
   - as needed, as required, PRN

Encyclopedia: Pro re nata

• truffle
• trug
• truism
• trull
• truly
• Truman
• Truman doctrine
• Trumbo
• Trumbull
• trump
• trump card
• trump out
• trump up
• trumped-up
• lima bean plant
• Limacidae
• limacine
• limacoid
• liman
• Limanda
• Limanda ferruginea
• Limax
• limb
• limb-girdle muscular dystrophy
• limbed