Vapor

/ˈveɪpər/

Meaning & Definition

noun
A substance diffused or suspended in the air, especially in the form of tiny particles of liquid or solid.
The vapor from the boiling water rose into the air.
The gaseous state of a substance that is normally liquid or solid at room temperature.
When heated, the ice transformed into water vapor.
An often transient state or condition that is imperceptible or insubstantial.
His promises turned to vapor as time passed.
verb
To convert (a substance) into vapor or steam.
The scientist vaporized the liquid using a special apparatus.
To become or cause to become vapor.
The sunlight caused the dew on the grass to vapor away.

Etymology

Middle English, from Latin vapor, meaning 'mist, steam, or air'.

Common Phrases and Expressions

vapor trail
The visible path left by an aircraft in the sky, caused by water vapor.
vapor lock
A condition in which vaporized fuel prevents a liquid fuel system from operating correctly.

Related Words

condensation
The process of a gas turning into a liquid.
evaporation
The process of a liquid changing into a vapor.
humidity
The amount of water vapor present in the air.

Slang Meanings

To vaporize or smoke a substance, often referring to marijuana.
He decided to vapor after dinner instead of smoking cigarettes.
To brag or boast, often about one's abilities or possessions.
She was just vapor about her new job and how much money she was making.