Which suffix indicates a specialty?

The suffix that indicates a specialty is "-istry." This suffix is commonly used in medical terminology to denote a specific field of study or practice related to a particular subject. For instance, in the field of medicine, terms like "dentistry" refer specifically to the specialty concerned with dental health and treatment. Similarly, "podiatry" refers to the specialty focused on foot health.

In contrast, the other suffixes serve different purposes. The suffix "-ician" often refers to a practitioner or professional in the field, as seen in words like "physician," which indicates a medical doctor. The suffix "-ile" is often used to describe capability or suitability, such as in "fragile." The suffix "-ior" generally means related to or pertaining to, and does not imply a specialty. Hence, "-istry" is the definitive indication of a specialty in medical terminology.