こうめいせき 光明石 LinksSentence search for 光明石Sentence search for こうめいせきSentence search for こうみょうせきKanji details for 光, 明 and 石Edit in JMdict Noun1. kōmeiseki; kōmei stone; slightly radioactive stone used in onsens, traditional medicine, etc.Other forms光明石 【こうみょうせき】 Discussions Log in to talk about this word.