In a general sense, an invisible elastic fluid, rendered aeriform by heat, and capable of being condensed, or brought back to the liquid or solid state, by cold. The vapor of water is distinguished by the name of steam, which see.

A visible fluid floating in the atmosphere. All substances which impair the transparency of the atmosphere, as smoke, fogare in common language called vapors, though the term vapor is technical applied only to an invisible and condensible substance, as in No. 1; fogbeing vapor condensed, or water in a minute state of division. Vapor rising into the higher regions of the atmosphere, and condensed in large volumes, forms clouds.

Substances resembling smoke, which sometimes fill the atmosphere, particularly in America during the autumn.

Wind; flatulence.

Mental fume; vain imagination; unreal fancy.

Vapors, a disease of nervous debility, in which a variety of strange images float in the brain, or appear as if visible. Hence hypochondriacal affections and spleen are called vapors.

Something unsubstantial, fleeting or transitory. For what is your life? It is even a vapor, that appeareth for a little time, and then vanisheth away. James 4:14.

To pass off in fumes or a moist floating substance; to steam; to be exhaled; to evaporate.

To emit fumes. Running water vapors not so much as standing water.

To bully; to boast or vaunt with a vain ostentatious display of worth; to brag. And what in real value’s wanting, supply with vaporing and ranting.

To emit, cast off or scatter in fumes or stream; as, to vapor away a heated fluid. Another sighing vapors forth his soul.