rootbeer Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a sweet carbonated beverage flavored with roots and herbs. Example Sentence The rootbeer had a thick head of froth. Spelled as one word. More Example Sentences Root beer floats are a popular treat. Synonyms soda; pop; soft drink Antonyms water Hear It! Say It! Write It! rootbeer Switch to cursive Start Share with your friends: