The suffix -ac is used to indicate what?

The suffix -ac is used to indicate "pertaining to." This linguistic element is frequently found in medical terminology, where it helps to form adjectives that describe a relationship to a particular body part or condition. For instance, in the term "cardiac," it refers to something pertaining to the heart. Understanding the use of this suffix is critical for interpreting and constructing medical terms accurately, enabling effective communication in a clinical setting.

The other options reflect different aspects of medical terminology. While location might be indicated by other suffixes such as -al (as in "spinal," relating to the spine), and condition may be represented by suffixes like -osis (as seen in "neurosis"), size typically utilizes other forms like -macro (large) or -micro (small). Thus, the choice of -ac aligns specifically with the meaning of being related to or concerning a specific anatomical feature or physiological process.