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The occurrence of white spots, streaks, or patches underthe nails, due to the presence of air bubbles between the nail and its bed.
[leuko- + G. onyx (onych-), nail]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
leuconychiaWhite discoloration of, or white patches in, the fingernails.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005