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Definition of Onychorrhexis
1. Noun. (pathology) fingernail and toenail brittleness and breakage, such as may be due to excessive strong soap and water exposure, nail polish remover, hypothyroidism, anemia, anorexia nervosa or bulimia, or after oral retinoid therapy. ¹
¹ Source: wiktionary.com
Medical Definition of Onychorrhexis
1. Abnormal brittleness of the nails with splitting of the free edge. Origin: onycho-+ G. Rhexis, a breaking (05 Mar 2000)