| ER- | decreased estrogen receptor |
|---|---|
| ER+ | increased estrogen receptor |
| ERA | electrical response activity; electroencephalic response audiometry; Electroshock Research Associati... |
| ERP | early receptor potential; effective refractory period; elodoisin-related peptide; endoscopic retrogr... |
| ERT | esophageal radionuclide transit; estrogen replacement therapy; examination room terminal; external r... |