| ER | (Sumerian and Akkadian) goddess of death and consort of Nergal |
|---|---|
| ER | (Sumerian and Akkadian) goddess of death and consort of Nergal |
| ER | an abnormally high degree of irritability or sensitivity or excitability |
| ER | a genus of Erethizontidae |
| ER | porcupine of northeastern North America with barbed spines concealed in the coarse fur |
| ER | New World arboreal porcupines |
| ER | hawksbills |
| ER | pugnacious tropical sea turtle with a hawk-like beak |
| ER | fictitious land described in the novel Erewhon by Samuel Butler |
| ER | a cgs unit of work or energy |
| ER | (used as a sentenced connector) therefore or consequently |
| ER | a fat-soluble vitamin that prevents rickets |