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fallen arch

noun
  1. collapse of the arch formed by the instep of the foot, resulting in flat feet
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
fallen arch in Medicine

fallen arch

(fô′lən)
n.
  1. A breaking down of the longitudinal or transverse arch of the foot, resulting in flat foot or spread foot.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.