核分裂反応 かくぶんれつはんのう Meanings Noun nuclear fission; fission reaction Kanji 核 nucleus. Read as カク. 分 part. Read as ブン. 裂 rip. Read as レツ. 反 anti-. Read as ハン. 応 respond. Read as ノウ. Jinuma: Japanese Dictionary · Word lists