Etymology
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combustible (adj.)

"capable of burning," 1520s, from French combustible, or directly from Late Latin combustibilis, from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). Figurative sense "easily excited" is from 1640s. As a noun, "a substance that will burn," from 1680s. Related: Combustibility (late 15c.).

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Definitions of combustible
1
combustible (n.)
a substance that can be burned to provide heat or power;
Synonyms: combustible material
2
combustible (adj.)
capable of igniting and burning;
From wordnet.princeton.edu