noun, plural ep·o·nych·i·a [ep-uhnik-ee-uh] /ˌɛp əˈnɪk i ə/,

  1. Embryology. the modified outer layer of the epidermis that partially covers the fetal fingernails and toenails and that persists after birth as the cuticle.
  2. Anatomy. a thin, cuticular fold extending over the lunula of a nail.


  1. The condensed eleidin-rich areas of the epidermis preceding the formation of nails in the embryo.
  2. The thin skin adhering to the nail at its base.

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