onychomycosis

[ ŏn′ĭ-kō-mī-kōsĭs ]

n.

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

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