Pronunciation: (ep"u-nik'ē-um), [key]
—pl. -nych•i•aPronunciation: (-nik'ē-u), [key]
1. Embryol.the modified outer layer of the epidermis that partially covers the fetal fingernails and toenails and that persists after birth as the cuticle.
2. Anat.a thin, cuticular fold extending over the lunula of a nail. Also,epionychium.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.