[ ŏn′ĭ-kō-mī-kō′sĭs ]
A fungal infection of the fingernails or toenails that results in thickening, roughness, and splitting of the nails. It is usually caused by Trichophyton rubrum or T. mentagrophytes.tinea unguium
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.