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spontaneous combustion

noun
🔊/spɒnˌteɪniəs kəmˈbʌstʃən/
🔊/spɑːnˌteɪniəs kəmˈbʌstʃən/
[uncountable]
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  1. the burning of a mineral or vegetable substance caused by chemical changes inside it and not by fire or heat from outside自燃