What does the suffix ologist mean?

The suffix "-ologist" means "one who studies or is an expert in." It's derived from the Greek word "-logos," meaning "study" or "science."

Here are some examples:

* Biologist: A person who studies living organisms.

* Geologist: A person who studies the Earth's physical structure and history.

* Psychologist: A person who studies the mind and behavior.

* Astrologist: A person who studies the influence of stars and planets on human affairs.

The "-ologist" suffix is commonly used in science and other fields to denote an expert or specialist in a particular area of study.