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,
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,
• (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’.