n. An exhalation of moisture; any visible diffused substance, as fog, mist, steam, or smoke, floating in the atmosphere and impairing its transparency.n. In physics, the gaseous form which a solid or liquid substance assumes when sufficiently heated.n. Effluence; influence.n. Wind; flatulence.n. In medicine, a class of remedies, officinal in the British pharmacopœia, which are to be applied by inhalation: such as vapor creasoti, a mixture of 12 minims of creosote in 8 fluidounces of boiling water, the vapor of which is to be inhaled.n. Something unsubstantial, fleeting, or transitory; vain imagination; fantastic notion.n. plural A hectoring or bullying style of language or conduct, adopted by ranters and swaggerers with the purpose of bringing about a real or mock quarrel.n. plural A disease of nervous debility in which strange images seem to float hazily before the eyes, or appear as if real; hence, hypochondriacal affections; depression of spirit; dejection; spleen; “the blues”: a term much affected in the eighteenth century, but now rarely used.To pass off in the form of vapor; dissolve, as into vapor or thin air; be exhaled; evaporate.To give out vapor, steam, or gas; emit vapors or exhalations; exhale; steam.To boast or vaunt; bully; hector; brag; swagger; bounce.To cause to pass into the state of vapor; cause to dissolve or disappear in or as in vapor, gas, thin air, or other unsubstantial thing.To afflict or infect with vapors; dispirit; depress.To bully; hector.