核かく分ぶん裂れつ連れん鎖さ反はん応のうMeaningsNoun1. fission chain reactionKanji used核nucleus分part裂split連take along鎖chain反be against応respond with actionComposed of核かく分ぶん裂れつnuclear fission; karyokinesis (division of a cell nucleus during mitosis or meiosis)Noun連れん鎖さ反はん応のうchain reaction; nuclear chain reactionNoun