Where does “自然発火” come from?

自然発火 (Japanese) comes from Japanese 自然 — naturally; spontaneously; rarely.

自然発火 (Japanese): spontaneous combustion

Definitions

  1. spontaneous combustion

Ancestry of “自然発火”, step by step

自然発火 traces back through two separate lines of ancestry.

via Japanese 自然

StepLanguageWordMeaning
1Japanese自然naturally; spontaneously; rarely

via Japanese 発火

StepLanguageWordMeaning
1Japanese発火ignition
Every word from Japanese 自然