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[ep-uh-nik-ee-uh m] /ˌɛp əˈnɪk i əm/
noun, plural eponychia
[ep-uh-nik-ee-uh] /ˌɛp əˈnɪk i ə/ (Show IPA)
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.
Also, epionychium.
Origin of eponychium
1880-85; < New Latin, equivalent to ep- ep- + onych- (see onyx) + -ium -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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eponychium in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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