Vapor meaning : Cloudy diffused matter such as mist, steam or fumes suspended in the air. The gaseous state of a substance that is normally a solid or liquid. Something insubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting. Any medicinal agent designed for administration in the form of inhaled vapour. (in the plural) Hypochondria; melancholy; the blues; hysteria, or other nervous disorder. Wind; flatulence. To become vapor; to be emitted or circulated as vapor. To turn into vapor. To emit vapor or fumes. To use insubstantial language; to boast or bluster. To give (someone) the vapors; to depress, to bore.