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prehormone

(prē-hôrmōn′)
n.
  1. A glandular secretory product that is a precursor of a hormone but has little or no inherent biological potency itself.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.