/ ˈfluːɪd; NAmE / noun , adjective
■ noun
[ C , U ] a liquid; a substance that can flow :
body fluids (= for example, blood)
The doctor told him to drink plenty of fluids.
cleaning fluid
■ adjective
1.
( formal ) ( of movements, designs, music, etc. ) smooth and elegant
SYN flowing :
a loose, fluid style of dancing
fluid guitar playing
the fluid lines of the drawing
2.
( formal ) ( of a situation ) likely to change; not fixed :
a fluid political situation
3.
( technical ) that can flow freely, as gases and liquids do :
a fluid consistency
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WORD ORIGIN
late Middle English (as an adjective): from French fluide or Latin fluidus , from fluere to flow.