| IO | incisal opening; inferior oblique; inferior olive; internal os; interorbital; intestinal obstruction... |
|---|---|
| LAO | left anterior oblique; left atrial overload; Licentiate of the Art of Obstetrics |
| LIO | left inferior oblique |
| LOIH | left oblique inguinal hernia |
| LPO | lactoperoxidase; left posterior oblique; light perception only; lipid peroxidation |