combust
Concise Oxford English Dictionary © 2008 Oxford University Press:
combust /kəmˈbʌst/
▶verb burn or be burnt by fire.
– derivatives
combustible adjective & noun,
combustor noun.
combustible adjective & noun,
combustor noun.
– origin C15 (earlier (ME) as combustion): from obs. combust ‘burnt’, from L. combust-, comburere ‘burn up’.
'combust' also found in these Oxford entries:

