ebony: Wood from several tree species in the genus Diospyros, favored for its durability, hardness, and ability to take high polish. In India it was used for drinking cups for its supposed ability to neutralize poison. Use these days is mainly decorative.
Eeylops Owl Emporium: A store in Diagon Alley, where Harry got Hedwig.
Elfric the Eager (PS ch. 16): The leader of a notable historical uprising.
Etym: From the Old English words for "elf" and "ruler".
Elixir of Life: A formula that extends the lifespan indefinitely, made possible with a Philosopher's Stone.
Emeric the Evil: Some historical personage who could be confused with Uric the Oddball.
Etym: From an Old German root Im- or Em-, of unknown meaning, + ric "ruler". Also, emerick is an obsolete alternate form of emery.
Emeric Switch: Etym: See above.
Emma Dobbs: Etym: A hypocoristic form of various Old German names combined with ermin/irmin "whole, universal".
Enid (PS ch. 7): Neville Longbottom's great-aunt.
Etym: Celtic name of uncertain derivation. In Arthurian legend, the wife of Geraint, noted as an example of long-suffering patience.
Erised stra ehru oyt ube cafru oyt on wohsi: The inscription on the Mirror of Erised, describing soed ti tahw.