coronaviruses Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a type of virus that causes diseases in mammals and birds. Example Sentence Coronaviruses are a type of virus that can cause diseases in mammals and birds. Synonyms SARS-CoV-2; MERS-CoV; SARS-CoV Antonyms bacterium; fungus Hear It! Say It! Write It! coronaviruses Switch to cursive Start Share with your friends: