noun / adjective
fluid
FLOO-id/ˈfluːɪd/
A substance able to flow rather than retain a fixed shape.
The fluid pours continuously from the pitcher and fills the bowl.
Etymology
Fluid first described something capable of flowing. The scientific noun turns that quality into a category: liquids and gases are fluids because their particles move freely.
In context
Synovial fluid is this lubricant-like substance that's found in between your joints. It kind of looks like an egg yolk.
More examples
- Air is a fluid, even though it is not a liquid.
- The melted wax stays fluid while it is warm.
- You lose fluids when you sweat.
- Our plans remain fluid until all participants confirm their availability.
Forms
fluid · fluids · more fluid · most fluid
fluidity noun — The quality of flowing or changing easily.