1. An epithelial neoplasm or hamartoma of the skin, especially of skin appendage origin.
2. Obsolete term for a carcinoma of the skin derived from squamous, basal, or adnexal cells.
The definition information for epithelioma is provided by Stedman's. You can search our medical dictionary here.
Stedman's, part of Lippincott Williams & Wilkins, provides a comprehensive line of health-science publications for healthcare professionals and medical students.