Meaning of “liquid” - Learner’s Dictionary

liquid

noun [ C, U ] us uk /ˈlɪkwɪd/
a milky liquida colourless liquidThe medicine comes in the form of a liquid or pills.Be careful with hot liquids such as coffee when there are children around.Drink plenty of liquids when you have a fever.
SUBSTANCE

B1 a substance, for example water, that is not solid and that can be poured easily

liquid adjective

B1

liquid fuel/nitrogen

(Definition of “liquid noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)