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combust

American  
[kuhm-buhst] / kəmˈbʌst /

verb (used with or without object)

  1. to burn.


combust British  
/ 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

"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

verb

  1. 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

Etymology

Origin of combust

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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