外丹功 wàidāngōng Waidangong (health exercise) Origin Definitions Defs Strokes Stroke Words Sentences Sents 外丹 wàidān external alchemy Daoist practice of using furnaces and crucibles to refine minerals such as lead and mercury into elixirs of immortality功 gōng nounverb skill skill; craftsmanship; the time and effort spent mastering a technique