軽けい水すい原げん子し炉ろMeaningsNoun1. light-water nuclear reactorKanji used軽lightweight水water原original子child炉furnaceComposed of軽けいlight (e.g. aircraft, truck); light motor vehicle (up to 660cc and 64bhp); kei carPrefix水すいWednesday; shaved ice (served with flavored syrup); water (fifth of the five elements)Noun原げん子し炉ろatomic reactor; nuclear reactorNoun