ology

You've probably heard words like biology (the study of life) or psychology (the study of the mind). That `-ology` ending is a suffix that turns a topic into a named field of study. You can often think of it as meaning "the study of" or "the science of" whatever comes before it. For example, volcanology means the study of volcanoes. It appears in many names for specialized subjects, from archaeology (the study of ancient cultures) to zoology (the study of animals). If someone is deeply interested in a subject, there is often an `-ology` word for it.

The suffix `-ology` comes from the Greek word logos, which can mean "word," "reason," or "study." In English, it developed into an ending used for the systematic study of a subject. It usually points to more than simple interest. When a word ends in `-ology`, it often names a recognized area of learning or a serious subject of study.

You will see `-ology` in many academic and professional words. Cardiology is the study of the heart, dermatology is the study of the skin, and geology is the study of the Earth. But it is not limited to the natural sciences. There is also demonology, which deals with demons in religion or folklore, and numerology, which refers to a belief system about the hidden meaning of numbers rather than a science.

One useful thing about `-ology` is how flexible it is. It can join many different roots to name a specific subject area. Some `-ology` words refer to well-established fields, while others are rare, informal, or tied to beliefs that are not scientific. Even so, the ending usually tells you that the word is about a subject being studied in an organized way. So when you hear a word ending in `-ology`, you can usually understand it as pointing to the study of something.