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combust

[kuh m-buhst] /kəmˈbʌst/
verb (used without object), verb (used with object)
1.
to burn.
Origin of combust
1325-1375
1325-75; Middle English < Latin combūstus (past participle of combūrere to burn up, equivalent to com- com- + -ūs- variant stem of ūrere to burn + -tus past participle suffix; -b- by misanalysis of ambūrere, another derivative, as am- + -būrere)
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for combust

combust

/kəmˈbʌst/
adjective
1.
(astrology) (of a star or planet) invisible for a period between 24 and 30 days each year due to its proximity to the sun
verb
2.
(chem) to burn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for combust

late 14c. as an adjective, "burnt," from Old French combust (14c.), from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). Also an astrological term for planets when near the sun. The verb is attested from late 15c. Related: Combusted; combusting.

Online Etymology Dictionary, © 2010 Douglas Harper
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13
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