reservoirs Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. large natural or artificial lakes used to store water. Example Sentence it's important to maintain water reservoirs. More Example Sentences Reservoirs help provide water to cities. Synonyms water storage; lake; basin Antonyms drain Hear It! Say It! Write It! reservoirs Switch to cursive Start Share with your friends: