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

This is when the top layer of your skin (epidermis) activates (synthesizes) vitamin D when exposed to the sun's ultraviolet (UV) radiation. —Lana Barhum, Verywell Health, 30 Oct. 2024

Emollients aim to smooth and lubricate the outermost layer of our epidermis and include ingredients such as ceramides and silicones. —Audrey Noble, Vogue, 23 Oct. 2024

When applied topically, glycerin lubricates the outer layer of your skin (epidermis) to keep water in and avoid dryness. —Carley Millhone, Health, 8 Oct. 2024

To avoid aggravation, Czech recommends taking a minimal approach to physical exfoliation, which can cause micro-tears on the epidermis if you get carried away. —Lauren Valenti, Vogue, 4 Oct. 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