| IS | ileal segment; immediate sensitivity; immune serum; immunosuppression; impingement syndrome; incenti... |
|---|---|
| ISR | information storage and retrieval; Institute for Sex Research; Institute of Surgical Research; insul... |
| PIRS | plasma immunoreactive secretion |
| PS | pacemaker syndrome; paired stimulation; paradoxical sleep; paraspinal; parasympathetic; Parkinson sy... |
| PTHS | parathyroid hormone secretion [rate] |