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Definition of Nail furrows

Nail furrows: Transverse lines or grooves across the fingernails; transverse depressions in the nail plate caused by temporary cessation of cell division in the proximal nail matrix. The condition may be caused by local disease of the nail fold, physical trauma to it, or a systemic insult, such as an illness or a drug as, for example, chemotherapy. Also known as Beau's lines.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=40058
Last Editorial Review: 3/19/2012

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