vapor

[vey-per]

noun

verb (used with object)

to cause to rise or pass off in, or as if in, vapor; vaporize.
Archaic. to affect with vapors; depress.

verb (used without object)


Also especially British, va·pour.

Origin of vapor

1325–75; Middle English vapour < Latin vapor steam
Related formsva·por·a·ble, adjectiveva·por·a·bil·i·ty, nounva·por·er, nounva·por·less, adjectiveva·por·like, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


Examples from the Web for vapor

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British Dictionary definitions for vapor

vapor

noun

the US spelling of vapour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for vapor
n.

late 14c., from Anglo-French vapour, from Latin vaporem (nominative vapor) "exhalation, steam, heat," 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.

Online Etymology Dictionary, © 2010 Douglas Harper

vapor in Medicine

vapor

[vāpər]

n.

Barely visible or cloudy diffused matter, such as mist, fumes, or smoke, suspended in the air.
The state of a substance that exists below its critical temperature and that may be liquefied by application of sufficient pressure.
The gaseous state of a substance that is liquid or solid under ordinary conditions.
The vaporized form of a medicinal preparation to be administered by inhalation.
A mixture of a vapor and air, as an explosive mixture of gasoline and air burned in an internal-combustion engine.
vapors Exhalations within an organ, especially the stomach, supposed to affect the mental or physical condition. No longer in technical use.
vapors A nervous disorder such as depression or hysteria. No longer in technical use.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

vapor in Science

vapor

[vāpər]

The gaseous state of a substance that is normally liquid or solid at room temperature, such as water that has evaporated into the air. See more at vapor pressure. See also water vapor.
A faintly visible suspension of fine particles of matter in the air, as mist, fumes, or smoke.
A mixture of fine droplets of a substance and air, as the fuel mixture of an internal-combustion engine.
Related formsvaporize verb
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.