A liquid (as opposed to a solid or gas).
Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.
Intravenous fluids.
In a state of flux; subject to change.
Of or relating to fluid.
Moving smoothly, or giving the impression of a liquid in motion.
Convertible into cash.
Genderfluid.
Any fuel derived from hydrocarbon deposits such as coal, petroleum, natural gas and, to some extent, peat; these fuels are non-renewable, and their burning moves carbon from underground into the atmosphere via the greenhouse gas carbon dioxide.