setae Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. stiff, hair-like structures found on the bodies of insects. Example Sentence The caterpillar's body was covered in setae, giving it a fuzzy appearance. Synonyms bristles; hairs; spines Antonyms smooth; hairless Hear It! Say It! Write It! setae Switch to cursive Start Share with your friends: