com·bust

[kuhm-buhst]
verb (used without object), verb (used with object)

Origin:
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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World English Dictionary
combust (kəmˈbʌst) [Click for IPA pronunciation guide]
 
adj
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
 
vb
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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00:10
Combust is always a great word to know.
So is doohickey. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

combust
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 fact that they demonstrably can spontaneously combust three weeks after
  being damaged is a matter of great concern.
Libertarians will combust over the taxes needed to fund the stake, contending
  that they will inhibit economic growth.
The impact causes the warhead to combust before it hits the armour.
Hydroelectric facilities and electric utilities that combust natural gas are
  not required to report.
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