Which suffix means "pertaining to"?

The suffix that means "pertaining to" is indeed -atic. This suffix is commonly used in medical terminology to form adjectives that describe conditions or relate to certain anatomical structures. For example, "cardiopathic" relates to heart disease, indicating that the term describes something pertaining to the heart.

Understanding the function of suffixes is crucial in medical terminology as they help to modify the meaning of words to provide more specific information. In contrast, the other suffixes listed have different meanings: -clasia refers to the process of breaking or destroying, -itis denotes inflammation, and -osis signifies a condition or disease, especially one that is abnormal or diseased. Each suffix serves a distinct purpose in medical language, illustrating how they contribute to the clarity and precision necessary in the field.