| MASER | microwave amplification by stimulated emission of radiation |
|---|---|
| OAE | otoacoustic emission |
| OES | oral esophageal stethoscope; optical emission spectroscopy |
| PET | peak ejection time; polyethylene terphthalate; poor exercise tolerance; positron emission tomography... |
| PETT | pendular eye-tracking test; positron emission transverse tomography |