Final answer:
The element in the word sialadenosis that means gland is 'C. Aden-'. 'Aden-' is a common medical prefix derived from Greek that is used in terms describing glandular conditions.
Step-by-step explanation:
The element in the word sialadenosis that means gland is C. Aden-. The prefix sial- refers to saliva, aden- refers to gland, and the suffix -osis indicates a condition, usually abnormal. When we look at the word sialadenosis, it describes an abnormal condition of the salivary glands.
In medical terminology, the combination of various prefixes, suffixes, and combining forms is common to explain specific conditions or diseases. For instance, in the word sialadenosis, 'aden' is derived from the Greek word adēn meaning gland, and it's a key part of many medical terms that involve glands.