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Pronunciation: pro-hor'mon


  1. An intraglandular precursor of a hormone; proinsulin.
  2. Obsolete term formerly used to designate a substance developed in serum that antagonizes a specific antihormone, and thus enhances the action of the corresponding hormone.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.