轻水反应堆 qīngshuǐfǎnyìngduī light water reactor Origin Definitions Defs Strokes Stroke Words Sentences Sents 轻水 輕水 qīngshuǐ light water Ordinary water, specifically used in physics and chemistry to distinguish it from 重水 zhòngshuǐ.反应堆 反應堆 fǎnyìngduī reactor A device used to initiate and control a nuclear reaction to produce energy; short for 原子核反应堆 yuánzǐhéfǎnyìngduī.