1) As needed 2) As needed, to a pharmacist 3) As required 4) Boogie Nights theme 5) Pro regarding nata 6) Pseudo-random noise 7) Wild suspicion 
Praseodymium(III) Nitride Molar mass: 154.91435
<abbreviation> L. Pro re nata, as the occasion arises; when necessary. ... (05 Mar 2000) ... 
Each GPS satellite generates its own distinctive PRN code, which is modulated onto each carrier. The PRN code identifies the satellite, as a timing signal, and as a sub carrier for the navigation data.
Patient Required (Medication)
Patient Required (Medication)Printer
Type: Abbreviation Definitions: 1. Abbreviation for L. pro re nata, as the occasion arises; when necessary.
porn
acronym: Pseudo-Random Noise