Definition

A gas or mist consisting of fine particles suspended in air; the gaseous form of a substance that is normally liquid or solid at room temperature. It can also refer to insubstantial or worthless ideas.

Example Usage

The vapor from the kettle fogged up the kitchen windows within minutes.

Origin

From Latin 'vapor' (steam, mist), possibly from an Indo-European root meaning to sway or move.

Fun Fact

The distinction between 'vapor' and 'gas' is that vapor refers to gases at temperatures below their critical point, while true gases exist above that point.

Source: Definition backfill (hailey)

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