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hyperphalangism

(hī′pər-fə-lănjĭz′əm, -fā-)
n.
  1. The presence of a supernumerary phalanx or phalanges in a digit.polyphalangism
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.