Grade 6 tentacles Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. any of various slender; flexible processes or appendages in animals esp. invertebrates that serve as organs of touch; prehension; etc. Example Sentence Octopus tentacles are very strong. Synonyms feeler; antenna; arm; appendage Antonyms head Hear It! Say It! Write It! tentacles Switch to cursive Start Share with your friends: