: capable of flowing like a liquid or gas <fluid lava>
: having a graceful or flowing style or appearance <a dancer's fluid movement>
Definition of FLUID for Kids
: something that tends to flow and take the shape of its container
Word Root of FLUID
The Latin word fluere, meaning “to flow,” gives us the root flu. Words from the Latin fluere have something to do with flowing. A fluid is a substance that flows and is usually a liquid. When someone is fluent in a language the words flow out of her or him. Anything superfluous, or extra, has flowed forth beyond what is necessary.