| IO | incisal opening; inferior oblique; inferior olive; internal os; interorbital; intestinal obstruction... |
|---|---|
| LSO | lateral superior olive; left salpingo-oophorectomy; left superior oblique; lumbosacral orthosis |
| MSO | management service organization; medial superior olive; medical staff organization |
| ol | oliv olive oil [Lat. oleum olivea] |