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Meaning of VAPOR

Pronunciation:  'veypur

WordNet Dictionary
  1. [n]  the process of becoming a vapor
  2. [n]  a visible suspension in the air of particles of some substance

VAPOR is a 5 letter word that starts with V.


 Synonyms: evaporation, vaporisation, vaporization, vapour, vapour
 See Also: boiling, clouding, clouding up, phase change, phase transition, physical change, smoke, smoking, state change, steam, suspension, water vapor, water vapour



Webster's 1913 Dictionary
  1. \Va"por\, n. [OE. vapour, OF. vapour, vapor, vapeur, F.
    vapeur, L. vapor; probably for cvapor, and akin to Gr. ?
    smoke, ? to breathe forth, Lith. kvepti to breathe, smell,
    Russ. kopote fine soot. Cf. {Vapid}.] [Written also
    1. (Physics) Any substance in the gaseous, or a["e]riform,
       state, the condition of which is ordinarily that of a
       liquid or solid.
    Note: The term vapor is sometimes used in a more extended
          sense, as identical with gas; and the difference
          between the two is not so much one of kind as of
          degree, the latter being applied to all permanently
          elastic fluids except atmospheric air, the former to
          those elastic fluids which lose that condition at
          ordinary temperatures. The atmosphere contains more or
          less vapor of water, a portion of which, on a reduction
          of temperature, becomes condensed into liquid water in
          the form of rain or dew. The vapor of water produced by
          boiling, especially in its economic relations, is
          called steam.
                Vapor is any substance in the gaseous condition
                at the maximum of density consistent with that
                condition. This is the strict and proper meaning
                of the word vapor.                 --Nichol.
    2. In a loose and popular sense, any visible diffused
       substance floating in the atmosphere and impairing its
       transparency, as smoke, fog, etc.
             The vapour which that fro the earth glood [glided].
             Fire and hail; snow and vapors; stormy wind
             fulfilling his word.                  --Ps. cxlviii.
    3. Wind; flatulence. [Obs.] --Bacon.
    4. Something unsubstantial, fleeting, or transitory; unreal
       fancy; vain imagination; idle talk; boasting.
             For what is your life? It is even a vapor, that
             appeareth for a little time, and then vanisheth
             away.                                 --James iv.
    5. pl. An old name for hypochondria, or melancholy; the
       blues. ``A fit of vapors.'' --Pope.
    6. (Pharm.) A medicinal agent designed for administration in
       the form of inhaled vapor. --Brit. Pharm.
    {Vapor bath}.
       (a) A bath in vapor; the application of vapor to the body,
           or part of it, in a close place; also, the place
       (b) (Chem.) A small metallic drying oven, usually of
           copper, for drying and heating filter papers,
           precipitates, etc.; -- called also {air bath}. A
           modified form is provided with a jacket in the outside
           partition for holding water, or other volatile liquid,
           by which the temperature may be limited exactly to the
           required degree.
    {Vapor burner}, a burner for burning a vaporized hydrocarbon.
    {Vapor density} (Chem.), the relative weight of gases and
       vapors as compared with some specific standard, usually
       hydrogen, but sometimes air. The vapor density of gases
       and vaporizable substances as compared with hydrogen, when
       multiplied by two, or when compared with air and
       multiplied by 28.8, gives the molecular weight.
    {Vapor engine}, an engine worked by the expansive force of a
       vapor, esp. a vapor other than steam.
  2. \Va"por\, v. i. [imp. & p. p. {Vapored}; p. pr. & vb. n.
    {Vaporing}.] [From {Vapor}, n.: cf. L. vaporare.] [Written
    also {vapour}.]
    1. To pass off in fumes, or as a moist, floating substance,
       whether visible or invisible, to steam; to be exhaled; to
    2. To emit vapor or fumes. [R.]
             Running waters vapor not so much as standing waters.
    3. To talk idly; to boast or vaunt; to brag.
             Poets used to vapor much after this manner.
             We vapor and say, By this time Matthews has beaten
             them.                                 --Walpole.
  3. \Va"por\, v. t.
    To send off in vapor, or as if in vapor; as, to vapor away a
    heated fluid. [Written also {vapour}.]
          He'd laugh to see one throw his heart away, Another,
          sighing, vapor forth his soul.           --B. Jonson.