floodplain Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. flat land next to a river that floods. Example Sentence The house was built on a floodplain so they got nervous if it rained a lot. More Example Sentences Animals moved to higher ground during floods. Synonyms riverbank; lowland; flood area Antonyms high ground Hear It! Say It! Write It! floodplain Switch to cursive Start Rhymes Two Syllable Rhymes (1) floodplain Share with your friends: