a. [ L. combustus, p. p. of comburere to burn up; com- + burere (only in comp.), of uncertain origin; cf. bustum funeral pyre, prurire to itch, pruna a live coal, Gr. pyrso`s firebrand, Skr. plush to burn. ] 1. Burnt; consumed. [ Obs. ] Chaucer. [ 1913 Webster ]

2. (Astron.) So near the sun as to be obscured or eclipsed by his light, as the moon or planets when not more than eight degrees and a half from the sun. [ Obs. ] [ 1913 Webster ]

Planets that are oft combust. Milton. [ 1913 Webster ]

n. The quality of being combustible. [ 1913 Webster ]

a. [ Cf. F. combustible. ] 1. Capable of taking fire and burning; apt to catch fire; inflammable. [ 1913 Webster ]

Sin is to the soul like fire to combustible matter. South. [ 1913 Webster ]

2. Easily kindled or excited; quick; fiery; irascible. [ 1913 Webster ]

Arnold was a combustible character. W. Irving. [ 1913 Webster ]

n. A substance that may be set on fire, or which is liable to take fire and burn. [ 1913 Webster ]

All such combustibles as are cheap enough for common use go under the name of fuel. Ure. [ 1913 Webster ]

n. Combustibility. [ 1913 Webster ]

n. [ L. combustio: cf. F. combustion. ] 1. The state of burning. [ 1913 Webster ]

2. (Chem.) The combination of a combustible with a supporter of combustion, producing heat, and sometimes both light and heat. [ 1913 Webster ]

Combustion results in common cases from the mutual chemical action and reaction of the combustible and the oxygen of the atmosphere, whereby a new compound is formed. Ure. [ 1913 Webster ]

Supporter of combustion (Chem.), a gas, as oxygen, the combination of which with a combustible, as coal, constitutes combustion. [ 1913 Webster ]

3. Violent agitation; confusion; tumult. [ Obs. ] [ 1913 Webster ]

There [ were ] great combustions and divisions among the heads of the university. Mede. [ 1913 Webster ]

But say from whence this new combustion springs. Dryden. [ 1913 Webster ]

. (Mech.) (a) A space over, or in front of, a boiler furnace where the gases from the fire become more thoroughly mixed and burnt. (b) The clearance space in the cylinder of an internal combustion engine where the charge is compressed and ignited. [ Webster 1913 Suppl. ]

a. Inflammable. [ Obs. ] Shak. [ 1913 Webster ]