[{"Bold_text": "noun", "List Items": ["a powerful motor-driven vehicle with large, heavy treads, used for pulling farm machinery, other vehicles, etc.", "Also calledtruck tractor.a short truck with a driver's cab but no body, designed for hauling a trailer or semitrailer.", "something used for drawing or pulling.", "Aeronautics.a propeller mounted at the front of an airplane, thus exerting a pull.Also calledtrac?tor air?plane.an airplane with a propeller so mounted.", "a propeller mounted at the front of an airplane, thus exerting a pull.", "Also calledtrac?tor air?plane.an airplane with a propeller so mounted."]}]