Legend the evil fairy half sister of King Arthur; in other legends, variously a water spirit, lake fairy, etc.
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'Morgan le Fay'
OFr Morgain la fée,
lit., Morgan the fairy < Celt, as in OIr Morrigain,
queen of the incubi, sorceress < *mor-
< IE base *mori-
) + OIr rigain,
queen < IE base *reg-,
to rule: see regal