Gaseous (adjective)

1. Existing in the form of a gas.
2. Relating to or resembling a gas in properties or behavior.
3. Not solid or liquid; in the state of a gas.

Origin:

The word "gaseous" comes from the latin word "gasosus" meaning full of gas. it has been in use since the 17th century.

Examples:

1. The substance was in a gaseous state.
2. The atmosphere was gaseous and difficult to breathe.
3. The planet was mostly gaseous with no solid surface.
4. The material was gaseous under high temperatures.
5. The substance was gaseous and easily compressible.