synthesiser Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a device that produces sounds electronically. Example Sentence Synthesiser may imitate other instruments or generate new timbres. More Example Sentences The synthesiser creates unique musical sounds. Synonyms synth; keyboard; electronic instrument Antonyms eye glasses Hear It! Say It! Write It! synthesiser Switch to cursive Start Share with your friends: