noun, plural eponychia [ep-uh-nik-ee-uh] .
Embryology. the modified outer layer of the epidermis that partially covers the fetal fingernails and toenails and that persists after birth as the cuticle.
Anatomy. a thin, cuticular fold extending over the lunula of a nail.

1880–85; < Neo-Latin, equivalent to ep- ep- + onych- (see onyx) + -ium -ium

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eponychium ep·o·nych·i·um (ěp'ə-nĭk'ē-əm)

  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.

The American Heritage® Stedman's Medical Dictionary
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