epidermis

noun

epi·​der·​mis ˌe-pə-ˈdər-məs 

1

a

: the outer epithelial layer of the external integument of the animal body that is derived from the embryonic epiblast

specifically : the outer nonsensitive and nonvascular layer of the skin of a vertebrate that overlies the dermis

b

: any of various animal integuments

2

: a thin surface layer of tissue in higher plants formed by growth of a primary meristem

Did you know?

Epidermis includes the Greek prefix epi-, meaning "outer;" thus, the epidermis overlies the dermis, or inner layer of skin. The epidermis itself consists of four or five layers; the outermost layer is made of dead cells, which are being shed continuously. The epidermis acts as a physical barrier—a protective wrap over the body's surface, which, by preventing water loss, allows vertebrates to live on land.

Examples of epidermis in a Sentence

Recent Examples on the Web

Celebrity aesthetician Athena Hewett adds that noninvasive RF treatments involve applying an electrode device to the skin, allowing the RF energy to penetrate a few millimeters deep to reach the collagen layer by passing through the epidermis. —Iman Balagam, Vogue, 14 Sep. 2024

Retinoids additionally thicken the epidermis, the outermost layer of the skin, which makes skin look smoother and wrinkles appear less prominent. —Lori Youmshajekian, Scientific American, 11 Sep. 2024

Environmental Exposure Exposure to harsh elements or substances in your environment can damage the epidermis or cause moisture loss, eventually resulting in dry skin and dead skin cells that fall off in large amounts. —Sarah Bradley, Health, 5 Sep. 2024

Experts don’t know why some people get PN and others don’t, but abnormalities in the nerves and immune system cells located in the top and middle layers of the skin (the epidermis and dermis) seem to be the cause.3 Historically, it was considered a rare disease. —Sarah Bradley, Health, 6 Sep. 2024

Word History

Etymology

Late Latin, from Greek, from epi- + derma skin — more at derm-

First Known Use

1626, in the meaning defined at sense 1a

Kids Definition

epidermis

noun

epi·​der·​mis ˌep-ə-ˈdər-məs 

1

: the thin outer layer of the animal body that in vertebrates forms an insensitive covering over the dermis

2

: a thin surface layer of protecting cells in seed plants and ferns

Medical Definition

epidermis

noun

epi·​der·​mis -ˈdər-məs 

1

: the outer epithelial layer of the external integument of the animal body that is derived from the embryonic epiblast

specifically : the outer nonsensitive and nonvascular layer of the skin of a vertebrate that overlies the dermis

2

: any of various animal integuments