| OM | obtuse mental; occipitomental; occupational medicine; ocular movement; oculomotor; Osborne Mendel [r... |
|---|---|
| OMD | ocular muscle dystrophy; oculomandibulodyscephaly; organic mental disorder; oromandibular dystonia |
| OMH | Office of Mental Health |
| OMS | organic mental syndrome; otomandibular syndrome |
| ONMRS | onychotrichodysplasia-neutropenia-mental retardation syndrome |