What does the -osis suffix mean?

The suffix "-osis" is used in medical terminology to denote a condition, usually indicating a pathological state or abnormal process. It often refers to diseases, particularly those that are chronic or degenerative, such as "fibrosis" or "neurosis." In general usage, it can imply an increase or abnormal state of something, such as "hyperkeratosis," which indicates an excessive thickening of the skin.