[{"Bold_text": "noun", "List Items": ["a woodwind instrument having a slender conical, tubular body and a double-reed mouthpiece.", "(in an organ) a reed stop with a sound like that of an oboe.", "(a word formerly used in communications to represent the letter O.)"]}, {"Bold_text": "noun", "List Items": ["a navigation system utilizing two radar ground stations that measure the distance to an aircraft and then radio the information to the aircraft."]}]