VAPOR

I. noun Etymology: Middle English vapour, from Anglo-French ~, from Latin, steam, ~ Date: 14th century diffused matter (as smoke or fog) suspended floating in the air and impairing its transparency, 2. a substance in the gaseous state as distinguished from the liquid or solid state, a substance (as gasoline, alcohol, mercury, or benzoin) ~ized for industrial, therapeutic, or military uses, 3. something unsubstantial or transitory ; phantasm , a foolish or fanciful idea, 4. plural exhalations of bodily organs (as the stomach) held to affect the physical or mental condition, a depressed or hysterical nervous condition, II. intransitive verb (~ed; ~ing) Date: 15th century 1. to rise or pass off in ~, to emit ~, to indulge in bragging, blustering, or idle talk, ~er noun