masculine or positive principle in Chinese philosophy, 1670s, from Mandarin yang, said to mean "male, daylight, solar," or "sun, positive, male genitals."
Entries linking to yang
yin n.
feminine or negative principle in Chinese philosophy, 1670s, from Chinese (Mandarin) yin, said to mean "female, night, lunar," or "shade, feminine, the moon." Compare yang. Yin-yang is from 1850.