The occurrence of smooth-surfaced white spots or patches under the nails, of unknown cause; the decoloration may be total or in the form of lines (striate or transverse l.) or dots (punctate l.). [leuko- + G. onyx (onych-), nail]
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leuk·onych·ia or chiefly Brit leuc·onych·ia .lü-kō-'nik-ē-ə n a white spotting, streaking, or discoloration of the fingernails caused by injury or ill health
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leu·ko·nych·ia (loo″ko-nikґe-ə) [leuko- + onych- + -ia] opaque, whitish discoloration of the nails, usually partial but occasionally total; there are several different causes. Called also leukopathia unguium.
Leukonychia.
Medical dictionary. 2011.