gaseous

adjective

1. existing in the state of a gas; not solid or liquid.
2. pertaining to or having the characteristics of gas.
3. Informal. lacking firmness or solidity; uncertain; not definite.
4. gassy(defs 1, 3).

adjective

1. of, concerned with, or having the characteristics of a gas

adj.

1799, from gas (n.) + -ous.

adj.

1. Of, relating to, or existing as a gas.
2. Full of or containing gas; gassy.

1. One of four main states of matter, composed of molecules in constant random motion. Unlike a solid, a gas has no fixed shape and will take on the shape of the space available. Unlike a liquid, the intermolecular forces are very small; it has no fixed volume and will expand to fill the space available.