| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |
|---|---|
| ad | add [Lat. adde] let there be added [up to a specified amount] [Lat. addetur]; axiodistal; right ear ... |
| add | addition; adductor, adduction; let there be added [Lat. addatur] |
| NAS | nasal; National Academy of Sciences; National Association of Sanitarians; neonatal airleak syndrome;... |
| NSA | Neurological Society of America; normal serum albumin; no salt added; no significant abnormality; no... |