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Webster's English Dictionary

vapor

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.] ()

1. (Physics) Any substance in the gaseous, or ariform, state, the condition of which is ordinarily that of a liquid or solid. ()

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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]. (Chaucer.)

Fire and hail; snow and vapors; stormy wind fulfilling his word. (Ps. cxlviii. 8.)

3. Wind; flatulence. (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. 14.)

5. An old name for hypochondria, or melancholy; the blues. (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 itself. (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. ()

v. i. [From Vapor, n.: cf. L. vaporare.] ()

1. To pass off in fumes, or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate. ()

2. To emit vapor or fumes. ()

Running waters vapor not so much as standing waters. (Bacon.)

3. To talk idly; to boast or vaunt; to brag. ()

Poets used to vapor much after this manner. (Milton.)

We vapor and say, By this time Matthews has beaten them. (Walpole.)

v. t. To send off in vapor, or as if in vapor; as, to vapor away a heated fluid. ()

He'd laugh to see one throw his heart away, Another, sighing, vapor forth his soul. (B. Jonson.)