fluidnoun [ C or U ]uk /ˈfluː.ɪd/ us /ˈfluː.ɪd/
- The patient was severely dehydrated and needed fluids urgently.
- These tanks are used for storing fluids such as oil, petrol and kerosene.
- Keep all your household cleaning fluids where children cannot reach them.
- Your stomach produces a large quantity of gastric fluid.
- There's some kind of thick fluid oozing from the trunk of the tree.