I. flu ‧ id 1 /ˈfluːəd, ˈfluːɪd/ BrE AmE noun [uncountable and countable] technical
a liquid ⇨ gas , solid :
He is not allowed solid food yet, only fluids.
a powerful cleaning fluid
II. fluid 2 BrE AmE adjective
[ Date: 1400-1500 ; Language: French ; Origin: fluide , from Latin fluidus , from fluere 'to flow' ]
1 . a situation that is fluid is likely to change
2 . fluid movements are smooth, relaxed, and graceful:
a loose, fluid style of dancing
3 . a fluid substance is a liquid
—fluidity /fluˈɪdəti, fluˈɪdɪti/ noun [uncountable]
⇨ gaseous
, solid