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4.19
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fluid noun [ ˈfluːɪd ]

• a substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid.
• "body fluids"
Similar: flowing substance, liquid, watery substance, moisture, solution, juice, sap, gas, gaseous substance, vapour,
Opposite: solid,

fluid adjective

• (of a substance) able to flow easily.
• "the paint is more fluid than tube watercolours"
Similar: flowing, able to flow easily, liquid, liquefied, melted, molten, uncongealed, running, gaseous, gassy, fluxional,
Opposite: solid,
• (of a clutch or coupling) using a liquid to transmit power.
Origin: late Middle English (as an adjective): from French fluide or Latin fluidus, from fluere ‘to flow’.


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