LATIN DICTIONARYLexicon Latīnum
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“combustion” in Latin

The English word combustion itself goes back to Latin ūrō, through combustio.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

combustion
burning, (α) exustio: crematio (to ashes): adustio (singeing, scorching): ustio (of a wound): (β) intr., deflagratio: conflagratio: incendium.
Tumult, tumultus (excited by slaves, peasants, or allies): motus (general term for disturbances in the state). Vid: COMMOTION.

Quick answer

What is the Latin word for combustion?
The usual Latin words for “combustion” are exustiō, cremātiō, adustiō; also ustiō, dēflagrātiō, cōnflagrātiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.