A long-term mental disorder involving a breakdown in the relation between thought, emotion, and behavior, leading to faulty perception, inappropriate actions and feelings, withdrawal from reality and personal relationships into fantasy and delusion, and a sense of mental fragmentation.
A now discredited theory of the 19th century which proposed that a person's character and mental abilities could be judged by the shape and size of different areas of their skull.
A person who studies or practices phrenology, the historical theory that a person's character and mental abilities can be judged from the shape of their skull.