What does the suffix "-iac" indicate when used in medical terminology?

The suffix "-iac" in medical terminology is used to indicate a relationship to a particular ailment, organ, or condition. For instance, the term "cardiac" relates to the heart, and "pediatric" pertains to children. Therefore, when "-iac" is added to a root word, it specifies that the subject being described has a connection or relevance to the specified condition or area of medicine. This understanding is crucial in interpreting various medical terms and helps in the effective communication and comprehension of medical discussions and documentation.