Someone who alternates between a good and an evil personality.
Alternative form of Jekyll and Hyde.
One who has a dual personality that alternates between phases of good and evil behavior.
Origin of jekyll-and-hyde
- After The Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson
From American Heritage Dictionary of the English Language, 5th Edition
- From The Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson