fluid
noun /ˈfluːɪd/
  /ˈfluːɪd/
[countable, uncountable] (formal or specialist)- a liquid; a substance that can flow
- body fluids (= for example, blood)
 - The doctor told him to drink plenty of fluids.
 - cleaning fluid
 
Extra Examples- It's important to replace fluids and salts that are lost during exercise.
 - Retaining excess fluid could be a problem.
 - They drained a lot of fluid from his lungs.
 
Oxford Collocations Dictionaryadjective- excess
 - amniotic
 - bodily
 - …
 
- drain
 - drink
 - lose
 - …
 
Word Originlate Middle English (as an adjective): from French fluide or Latin fluidus, from fluere ‘to flow’.