- (v.t.) To send off in vapor or as if in vapor; as, to vapor away a heated fluid.
- (n.) To emit vapor or fumes.
- (n.) To pass off in fumes or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate.
- (n.) Any substance in the gaseous or aeriform, state, the condition of which is ordinarily that of a liquid or solid.
- (n.) In a loose and popular sense, any visible diffused substance floating in the atmosphere and impairing its transparency, as smoke, fog, etc.
- (n.) Wind; flatulence.
- (n.) To talk idly; to boast or vaunt; to brag.
- (n.) A medicinal agent designed for administration in the form of inhaled vapor.
- (n.) Something unsubstantial, fleeting or transitory; unreal fancy; vain imagination; idle talk; boasting.
- (n.) An old name for hypochondria or melancholy; the blues.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). vapor. Retrieved September 21, 2026, from http://smartdefine.org/vapor/definitions/2078747 |
| Chicago | Webster's. 2011. "vapor" http://smartdefine.org/vapor/definitions/2078747 (accessed September 21, 2026). |
| Harvard | Webster's 2011, vapor, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/vapor/definitions/2078747>. |
| MLA | Webster's. "vapor" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/vapor/definitions/2078747> |