[{"Bold_text": "noun", "List Items": ["a masklike device, usually of nonwoven fibrous materials, as fiberglass paper, wool felt, or polypropylene, worn over the mouth, or nose and mouth, to prevent the inhalation of noxious substances, pathogens, or the like:Respirators are essential protective equipment for healthcare providers during an outbreak.", "Medicine/Medical. ventilator(def3) ventilator(def3).", "British. gas mask gas mask."]}]