any substance in the gaseous, or aeriform, state, the condition of which is ordinarily that of a liquid or solid.-in a loose and popular sense, any visible diffused substance floating in the atmosphere and impairing its transparency, as smoke, fog, etc.-wind; flatulence.-something unsubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting.-an old name for hypochondria, or melancholy; the blues.-a medicinal agent designed for administration in the form of inhaled vapor.-to pass off in fumes, or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate.-to emit vapor or fumes.-to talk idly; to boast or vaunt; to brag.-to send off in vapor, or as if in vapor; as, to vapor away a heated fluid.