antibiotic /ˌæntibaiˈɔtik/ n. [c] 抗生素，抗菌素：Antibiotic is a medicine, such as penicillin or its derivatives. 抗生素是一类药，譬如青霉素或者其衍生品。I’m taking antibiotics for a throat infection. 因为喉部感染, 我在服用抗菌素。The doctor prescribed antibiotics.医生给开了抗生素。