yin definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
in Chinese philosophy, the passive, negative, feminine force or principle in the universe, both contrasted with and complementary to the yang
Origin: Mandarin yin, female, night, lunar
yin definition by American Heritage Dictionary
The passive, female cosmic principle in Chinese dualistic philosophy.
Origin: Chinese (Mandarin) yīn, moon, shade, female element.