- noun a substance which is not solid, whose molecules move freely past one another and that takes the shape of its container
Cars & Driving
- noun a substance which flows, e.g. a liquid or a gas
- A form of matter which has no defined shape, and whose atoms or molecules move freely past one another. A fluid is usually a gas or a liquid, and tends to assume the shape of its container.
- noun any gas, liquid or powder that flows