verb (used without object), verb (used with object)

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) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
combust (kəmˈbʌst)
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
2.  chem to burn

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., adj., "burnt," from O.Fr. combust (14c.) (see combustion). Also an astrological term for planets when near the sun; the verb is attested from late 15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The impact causes the warhead to combust before it hits the armour.
The biggest causes are the operation of fossil fuel-burning power plants and
  automobiles that combust fuel.
Then, last summer, his campaign seemed to spontaneously combust in a puff of
  fund-raising troubles and staff intrigue.
Libertarians will combust over the taxes needed to fund the stake, contending
  that they will inhibit economic growth.
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