1. The skin. (Google Dictionary)
2. The thick layer of living tissue below the epidermis that forms the true skin, containing blood capillaries, nerve endings, sweat glands, hair follicles, and other structures. (Google Dictionary)
3. (Science: anatomy, dermatology)
Mesodermally derived connective tissue underlying the epithelium of the skin. The deep vascular inner layer of the skin.The layer of skin below the epidermis, where the epidermis is in direct contact with the external environment and the dermis lies beneath. (biology-online.org)
4. A layer of skin between the epidermis (with which it makes up the cutis) and subcutaneous tissues, that consists of connective tissue and cushions the body from stress and strain. It is divided into two layers, the superficial area adjacent to the epidermis called the papillary region and a deep thicker area known as the reticular dermis. (wikipedia.org)
Word origin: From New Latin, from Ancient Greek δέρμα (derma, “skin, hide”), from δέρω (dero, “to skin, to flay”).