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hyperthymism

(hī′pər-thīmĭz′əm)
n.
  1. Excessive activity of the thymus gland.
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Related formshy′per•thymic adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.