[{"Bold_text": "noun", "List Items": ["a person or thing that explores .", "a person who investigates unknown regions:the great explorers of the Renaissance.", "any instrument used in exploring sounding a wound, a cavity in a tooth, or the like.", "(initial capital letter)Also called Explorer Scout.a person between the ages 14 and 20 who is an active participant in the exploring sponsored by the Boy Scouts of America.", "(initial capital letter)Aerospace.one of a long series of U.S. scientific satellites:Explorer 1(1958) was the first U.S. artificial satellite."]}]