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onychorrhexis

(ŏn′ĭ-kə-rĕksĭs)
n.
  1. Abnormal brittleness of the fingernails or toenails with splitting of the free edge.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.