| OEF | oil immersion field; oxygen extraction fraction |
|---|---|
| OIF | observed intrinsic frequency; oil immersion field; Osteogenesis Imperfecta Foundation |
| IF | idiopathic fibroplasia; idiopathic flushing; immersion foot; immunofluorescence; indirect fluorescen... |
| RWIS | restraint and water immersion stress |
| ISIS | image selected in vivo spectroscopy; imaging science and information system; information system-imag... |