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didactylism

(dī-dăktə-lĭz′əm)
n.
  1. A congenital defect in which there are only two digits on a hand or a 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.