[{"Bold_text": "noun", "List Items": ["any of various machines for grinding, pumping, etc., driven by the force of the wind upon a number of vanes or sails.", "(loosely) a wind generator wind generator; wind plant wind plant.", "Aeronautics.a small air turbine with blades, like those of an airplane propeller, exposed on a moving aircraft and driven by the air, used to operate gasoline pumps, radio apparatus, etc.", "an imaginary opponent, wrong, etc. (in allusion to Cervantes'Don Quixote):to tilt at windmills."]}, {"Bold_text": "verb (used with or without object)", "List Items": ["Aeronautics.(of a propeller engine or turbojet engine) to rotate or cause to rotate solely under the force of a passing airstream."]}]