A person, especially a physician, dentist, or veterinarian, trained in the healing arts and licensed to practice. A person who has earned the highest academic degree awarded by a college or university in a specified discipline. A person awarded an honorary degree by a college or university. Used as a title and form of address for a person holding the degree of doctor. Roman Catholic Church An eminent theologian. A practitioner of folk medicine or folk magic. A rig or device contrived for remedying an emergency situation or for doing a special task. Any of several brightly colored artificial flies used in fly fishing. Informal To give medical treatment to: "[He] does more than practice medicine. He doctors people. There's a difference\u201d ( Charles Kuralt). To repair, especially in a makeshift manner; rig. To falsify or change in such a way as to make favorable to oneself: doctored the evidence. To add ingredients so as to improve or conceal the taste, appearance, or quality of: doctor the soup with a dash of sherry. See Synonyms at adulterate. To alter or modify for a specific end: doctored my standard speech for the small-town audience. Baseball To deface or apply a substance to (the ball): was ejected because he doctored the ball with a piece of sandpaper. Informal To practice medicine.