Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun One who has a dual personality that alternates between phases of good and evil behavior.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Someone who alternates between a good and an evil personality.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun someone with two personalities - one good and one evil
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After  The Strange Case of Dr. Jekyll and Mr. Hyde,  by Robert Louis Stevenson.]
 from Wiktionary, Creative Commons Attribution/Share-Alike License
From The Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson
			
		
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Examples
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