fluids Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. substances that can flow and take shape. Example Sentence They gave lacteal fluids to the sick calf. More Example Sentences Fluids can be found in many forms. Synonyms liquids; gases; solutions Antonyms solid Hear It! Say It! Write It! fluids Switch to cursive Start Share with your friends: