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n. pl. per·i·o·nych·i·a (-ē-ə)
The border of epidermal tissue surrounding a fingernail or toenail.

[New Latin : peri- + Greek onux, onukh-, nail; see nogh- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -ia (-ɪə)
(Anatomy) the skin that surrounds a fingernail or toenail
[C19: New Latin, from peri- + Greek onux a nail]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌpɛr i oʊˈnɪk i əm)

n., pl. -nych•i•a (-ˈnɪk i ə)
the epidermis surrounding the base and sides of a fingernail or toenail.
[1900–05; peri- + Greek onych-, s. of ónyx nail (compare onyx) + -ium2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.