fluid

US /ˈfluɪd/

UK /'flu:ɪd/

B2
n. (c./u.)Noun (Countable/Uncountable)A material that can easily flow, e.g. water
Butter melts into a fluid form when it is heated
adj.AdjectiveAble to move smoothly or gracefully
She would dance in a fluid way across the dance floor
n. (c./u.)Noun (Countable/Uncountable)Liquid that flows smoothly, such as water
It is important to drink a lot of fluid while running
adj.AdjectiveLiable to change; unstable.
The political situation is very fluid at the moment.
adj.AdjectiveRelating to ready money or cash.
The company needs to maintain a fluid cash flow.
n. (c./u.)Noun (Countable/Uncountable)Liquid in the body.
The doctor recommended drinking plenty of fluids.

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