Medical Dictionary

onychomycosis on·y·cho·my·co·sis (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. Also called tinea unguium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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