There are multiple definitions:

1. Perinatale Registratie Nederland(Dutch)

   • Neonatology, Organization (management)

2. plaque reduction neutralization(English)

   • test sometimes used for viruses that form distinct plaques of CPE in cell cultures, with each plaque representing a single infectious unit. The end point is defined as the 90%). Neutralizing antibody can be used to differentiate viruses at the strain level
   • CPE, VN
   • Virology
   • https://doi.org…-0891-8.00012-9

3. pro re nata(Latin)

   • the administration of medication is not scheduled. Instead, the prescription is taken as needed; also denoted as prn
   • TER, NMUPO, TAE
   • Therapeutic approaches, Misconduct
   • https://www.ncb…les/PMC4129247/

4. post-rotary nystagmus(English)

   • slow phase occurrs in the same direction to passive body turning and is reduced in velocity after active body turning. After apparent turning, nystagmus is in the opposite direction as attempted body turning
   • Ophthalmology
   • https://doi.org…3/VES-1998-8402