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proestrogen in Medicine

proestrogen

(prō-ĕstrə-jən)
n.
  1. A precursor of estrogen that becomes an active hormone only after it has been metabolized.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.