Liquid (noun)

1. A substance that flows freely but is of constant volume, having a consistency like that of water or oil.
2. A liquid substance, especially a drink.

Origin:

Late middle english: from latin liquidus, from liquere "be liquid".

Examples:

1. Water is a liquid at room temperature.
2. Liquid gold is a metaphor for something that is very valuable.
3. Pour the liquid into the container.
4. Liquid nitrogen is used to preserve food.
5. His mouth felt like liquid, and he could barely speak.