Etymology
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vapor (n.)
late 14c., from Anglo-French vapour, Old French vapor "moisture, vapor" (13c., Modern French vapeur) and directly from Latin vaporem (nominative vapor) "a warm exhalation, steam, heat," which is of unknown origin. Vapors "fit of fainting, hysteria, etc." is 1660s, from medieval notion of "exhalations" from the stomach or other organs affecting the brain.
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vapour (n.)
chiefly British English spelling of vapor; see -or.
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vaporous (adj.)
late 14c., from Late Latin vaporosus "full of steam," from Latin vaporus, from vapor (see vapor).
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vaporetto (n.)
Venetian public transit canal-motorboat, 1926, from Italian vaporetto, diminutive of vapore "steam," from Latin vapor (see vapor (n.)).
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vaporize (v.)
1630s, "to smoke" (tobacco), from vapor + -ize. Later "convert into vapor, cause to become vapor" (1803), and "spray with fine mist" (1900). Intransitive sense "become vaporous" is from 1828. Related: Vaporized; vaporizing. An earlier verb was simply vapor (c. 1400, transitive and intransitive), from Latin vaporare.
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evaporation (n.)
late 14c., from Old French évaporation and directly from Latin evaporationem (nominative evaporatio), noun of action from past participle stem of evaporare "disperse in vapor or steam," from assimilated form of ex "out, out of" (see ex-) + vapor "steam" (see vapor).
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dumps (n.)

"low spirits; dull, gloomy state of mind," 1520s, plural of dumpe "a fit of musing," of uncertain origin, possibly from Dutch domp "haze, mist," from Middle Dutch damp "vapor" (see damp (n.)). Compare vapors under vapor.

The application of this term to an affection of the mind is a part of the medical theory which attributed all disorders of the frame to a humour falling on the part affected, and regarded mental disorders especially as produced by a vapour rising from the stomach into the brain. [Hensleigh Wedgwood, "A Dictionary of English Etymology," 1859]
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halitosis (n.)
"bad breath," 1874, coined in Modern Latin from Latin halitus "breath, exhalation, steam, vapor" (which is related to halare "to breathe, emit vapor") + Greek-based noun suffix -osis.
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vapid (adj.)
1650s, "flat, insipid" (of drinks), from Latin vapidus "flat, insipid," literally "that has exhaled its vapor," related to vappa "stale wine," and probably to vapor "vapor." Applied from 1758 to talk and writing deemed dull and lifeless. Related: Vapidly; vapidness.
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atmo- 
word-forming element meaning "vapor," from Greek atmos "vapor, steam," from PIE *awet-mo-, from root *wet- (1) "to blow" (also "to inspire, spiritually arouse;" see wood (adj.)).
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