| IRP | immunoreactive plasma; immunoreactive proinsulin; incus replacement prosthesis; insulin-releasing po... |
|---|---|
| IRTIS | Integrated Radiation Therapy Information System |
| LASER | light amplification by stimulated emission of radiation |
| LRT | local radiation therapy; long terminal repeat; lower respiratory tract |
| MASER | microwave amplification by stimulated emission of radiation |