solids Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. materials that have a definite shape and volume. Example Sentence Her baby will start on solids this week. More Example Sentences Different solids can be found in nature. Synonyms hard materials; firm substances; stable forms Antonyms liquids; gases; vapors Hear It! Say It! Write It! solids Switch to cursive Start Share with your friends: