erethizon dorsatum
- n porcupine of northeastern North America with barbed spines concealed in the coarse fur; often gnaws buildings for salt and grease
eretmochelys imbricata
- n pugnacious tropical sea turtle with a hawk-like beak; source of food and the best tortoiseshell
erewhon
- n a satirical novel written by Samuel Butler (1872) describing a fictitious land
erg
- n a cgs unit of work or energy; the work done by a force of one dyne acting over a distance of one centimeter