fluid Definition

fluid
noun

1. A substance, such as a liquid or gas, which can move about with freedom and has no fixed shape.

Thesaurus: liquid, vapour, solution.

adj

1. Able to flow like a liquid; unsolidified.

Thesaurus: flowing, liquid, melted, molten, runny, watery; Antonym: solid.
2. Said eg of movements: smooth and graceful.

Thesaurus: graceful, feline, smooth, sinuous, nimble.
3. Altering easily; adaptable.

Thesaurus: adaptable, changeable, flexible, mutable, unstable.

Derivative: fluidity
noun

Etymology: 17c: from Latin fluidus flowing.