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hyperleukocytosis

(hī′pər-lōō′kə-sī-tōsĭs)
n.
  1. An unusually large increase in number and proportion of white blood cells in blood or tissues.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.