| OMH | Office of Mental Health |
|---|---|
| OMS | organic mental syndrome; otomandibular syndrome |
| ONMRS | onychotrichodysplasia-neutropenia-mental retardation syndrome |
| PAMIE | physical and mental impairment of function evaluation |
| PMA | index of prevalence and severity of gingivitis, where P = papillary gingiva, M = marginal gingiva, a... |