LATIN DICTIONARYLexicon Latīnum
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“vapor” in Latin

The English word vapor itself goes back to Latin vapor.

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

vapor s.
Exhalation, vapor: halitus: nebula (from the earth or from water; the latter a cloud-like vapor): exhalatio: exspiratio: aspiratio (exhalation from the earth): respiratio (from water). Vapors rise from the water, aquae vaporant; from the earth, humores in aera surgunt: a vapor bath, assa sudatio, vaporatio (the bathing with steam or vapor); assum Laconicum (the chamber: ☞ Not vaporarium, which is = flue or furnace).
Melancholy, Vid.

Quick answer

What is the Latin word for vapor?
The usual Latin words for “vapor” are vapor, hālitus, nebula; also exhālātiō, exspīrātiō, aspīrātiō. 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.