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metyrapone

(mə-tîrə-pōn′)
n.
  1. An inhibitor of the hydroxylation of adrenocortical steroids administered as a diagnostic aid in determining pituitary gland function.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.