DEFLAGRATION, noun A kindling or setting fire to a substance; burning; combustion. The strength of spirit is proved by deflagration A rapid combustion of a mixture, attended with much evolution of flame and vapor, as of niter and charcoal. This term is also applied to the rapid combustion of metals by galvanism.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI