What does the suffix "-logy" indicate?

The suffix "-logy" is derived from the Greek word "logos," meaning "study" or "discourse." Therefore, it indicates a field of study or a branch of knowledge concerning a specific subject. For example, "biology" refers to the study of life, while "psychology" refers to the study of the mind. The other options refer to different medical terms: breaking down is commonly associated with the suffix "-lysis," infection is indicated by the suffix "-itis," and crushing is indicated by the suffix "-tripsy." Understanding the meaning of "-logy" helps in grasping the context of various scientific disciplines related to health and medicine.