Rough-surfaced nails. [G. trachys, rough, + onyx, onychos, nail, + suffix -ia, condition]

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tra·chy·onych·ia (tra″ke-o-nikґe-ə) [Gr. trachys rough + onych- + -ia] roughness of the nails with brittleness and splitting, usually associated with psoriasis, alopecia areata, or lichen planus. Called also twenty-nail dystrophy.

Medical dictionary. 2011.

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