炼丹，道教词语。为炼制外丹与内丹的统称。外丹术源于黄老道，是在丹炉中烧炼矿物以制造“仙丹”。其后将人体拟作炉鼎，用以习炼精气神，称为内丹术。外丹术指道家通过各种秘法烧炼丹药，用来服食，或直接服食某些芝草，以点化自身阴质，使之化为阳气。陈师道注：“道家以烹炼金石为外丹；龙虎胎息，吐故纳新为内丹。”
n. alchemy
misc. refining dan
“神话防御：光明势力”有塔防游戏的最佳元素，还包括一些原始特征的炼丹术，随机地图，战役等。
"Myth defense: Light Forces" has the best elements of tower defense games and also includes such original features as alchemy, random maps, campaign and more.
在炼丹的过程中，炼丹术士们围绕着丹砂以及与丹砂有关的物质进行了各种可能性的探索和实验，并了解到了许多相关的化学知识。
During the process of refining pills, some alchemists had understood chemical knowledge by various kinds of possible experiments and exploration on cinnabar and related materials.
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