Here are some examples of words using "derma" as a root:
* Dermatology: The study of skin and its diseases.
* Dermatitis: Inflammation of the skin.
* Epidermis: The outer layer of skin.
* Hypodermis: The layer of fat and connective tissue beneath the skin.
Prefixes are word parts that are added to the beginning of a word to change its meaning. Some examples of prefixes include "pre-", "un-", and "re-".