a nail of a toe.
Carpentry. a nail driven obliquely.
Printing Slang. a parenthesis.
verb (used with object)
Carpentry. to secure with oblique nailing.

1835–45; toe + nail Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To toenail
World English Dictionary
toenail (ˈtəʊˌneɪl)
1.  a thin horny translucent plate covering part of the dorsal surface of the end joint of each toeRelated: ungual, ungular
2.  carpentry a nail driven obliquely, as in joining one beam at right angles to another
3.  slang printing a parenthesis
4.  (tr) carpentry to join (beams) by driving nails obliquely
Related: ungual, ungular

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

toenail toe·nail (tō'nāl')
The thin, horny, transparent plate covering the upper surface of the end of a toe.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Attached to my skin was a giant ant the size of my toenail.
Dan also visits the clinic regularly for light muscle-training sessions and
  periodic toenail clipping.
To help the nail grow over the skin, gently place a small amount of cotton
  under the tip of the toenail.
Service connection for a right ingrown toenail is denied.
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