Common Medical Abbreviations and Acronyms

1. ORA
   Office of Research Affairs
2. ORCHIS
   System
3. ORD
   Ocean Research Division
4. ORG
   Organization
5. ORIEN
   Orientation
6. ORIENT
   Orientation
7. ORIF
   Open Reduction Internal Fixation
8. ORLENT
   Orientation
9. ORNDCASE
   Ornithine Decarboxylase
10. ORSA
    Oxacillin-resistant Staphylococcus Aureus - Operations Research Society of America
11. ORT
    Oral Rehydration Therapy
12. ORU
    Organized Research Unit
13. OS
    Left Eye
14. OS
    Overall Survival
15. OS
    Oculus Sinister
16. OS
    Orthopedic Surgery
17. OSA
    Obstructive Sleep Apnea
18. OSA
    Office of Student Affairs
19. OSD
    Office for Student With Disabilities
20. OSH
    Outside Hospital

Last updated: May 2, 2025 — Total entries: 7,183