biohazard Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a risk to human health or the environment from biological substances. Example Sentence They had to be very cautious removing the biohazard. More Example Sentences Protective gear is needed for biohazard work. Synonyms biological hazard; health risk; danger Antonyms safe; inorganic Hear It! Say It! Write It! biohazard Switch to cursive Start Rhymes Two Syllable Rhymes (2) hazard hazzard Three Syllable Rhymes (1) haphazard Four Syllable Rhymes (1) biohazard Share with your friends: