combustible (adj.)youdaoicibaDictYouDict[combustible 词源字典]
1520s, from Middle French combustible, or directly from Late Latin combustibilis, from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). Figurative sense is from 1640s; as a noun, from 1680s. Related: Combustibility (late 15c.).[combustible etymology, combustible origin, 英语词源]