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anarithmia

(ăn′ə-rĭthmē-ə, -rĭð-)
n.
  1. An inability to count or use numbers due to a brain lesion.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.