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.

(dated) Any medicinal agent designed for administration in the form of inhaled vapour.

(archaic, in the plural) Hypochondria; melancholy; the blues; hysteria, or other nervous disorder.

(obsolete) Wind; flatulence.

(intransitive) To become vapor; to be emitted or circulated as vapor.

(transitive) To turn into vapor.

To emit vapor or fumes.

(intransitive) To use insubstantial language; to boast or bluster.

(transitive) To give (someone) the vapors; to depress, to bore.