自然発生 しぜんはっせい Meanings Noun, の-adjective spontaneous generation; abiogenesis natural occurrence; spontaneous occurrence Kanji 自 self. Read as シ. 然 -ly. Read as ゼン. 発 emit. Read as ハツ. 生 life. Read as セイ. Example sentences 干し草に自然発生的に火がついた。A spontaneous fire started in the hay. Words containing 自然発生 自然発生説 (しぜんはっせいせつ) theory of spontaneous generation Word lists Biology Jinuma: Japanese Dictionary · Word lists