内丹术 nèidānshù internal alchemy Origin Definitions Defs Strokes Stroke Words Sentences Sents 内丹 內丹 nèidān internal alchemy Taoist practice of internal alchemy; it uses the body as a furnace to refine essence, breath, and spirit to achieve health or longevity, in contrast to 外丹 wàidān.术 術 shù noun skill (bound form) skill; technique; method; tactics