phrenologist

The term 'phrenologist' is a 19th-century construction built from classical Greek components to name a practitioner of the then-new 'science' of phrenology. The core root is phrēn, which in ancient Greek originally referred to the diaphragm, the muscle believed to be the seat of emotions and thought, and by extension came to mean "mind" or "intellect". This is combined with the agent suffix -logistēs (from logos, meaning "word, reason, study"), denoting a specialist. Thus, the word's literal construction means "one who studies the mind". The logic of the term reflects the now-discredited theory's claim to scientifically analyze mental faculties, but it locates them not in the brain's physiology, as we understand it, but in the external cranial landscape (phrēn here linked to skull shape).

Structure: phren (mind) + o (connective) + logist (one who studies) - phren: From Greek phrēn, meaning "mind, diaphragm". In this word, it functions as the root denoting the mind or mental faculties. - o: A connective vowel (interfix) used to join Greek-derived roots and suffixes. - logist: From Greek -logistēs, meaning "one who studies or has knowledge of a subject". It functions as an agent noun suffix.