IPA: /frɛnəˈlɒdʒɪkəl/
KK: /frɛnəˈlɑgɪkəl/
Related to the study of the shape and size of the skull as a supposed indication of character and mental abilities.
The phrenological theories of the 19th century suggested that personality traits could be determined by examining the bumps on a person's head.
Phrenological → It is formed from "phren-" (from Greek "phren", meaning mind or diaphragm) and "-logical" (from Greek "logia", meaning study or discourse). The word refers to the study of the mind or mental faculties, particularly as it relates to the shape of the skull.
Think of 'phren-' relating to the 'mind' and '-logical' meaning 'study' — phrenological is the study of the mind.