combustion

The story

1. Latin · derived fromcombustio
2. Old French · derived fromcombustion
3. English todaycombustion

From Old French combustion, from Latin combustio, from comburere (“to burn”), itself from the intensifying prefix com- + the root burere (a faulty sep. of amburere "to burn around", itself from ambi- + urere "to burn, singe"); equivalent to combust + -ion.