致死突然変異 ちしとつぜんへんい Meanings Noun lethal mutation Kanji 致 bring about. Read as チ. 死 die 突 thrust. Read as トツ. 然 -ly. Read as ゼン. 変 change. Read as ヘン. 異 different. Read as イ. Word lists Genetics Jinuma: Japanese Dictionary · Word lists