noun Pharmacology.
any substance having progesteronelike activity.
Also called progestogen.

1925–30; pro-1 + gest(ation) + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
progestogen or progestin (prəʊˈdʒɛstədʒən, prəˈdʒɛstɪn)
any of a group of steroid hormones that have progesterone-like activity, used in oral contraceptives and in treating gynaecological disorders
[C20: from progest(erone) + -o- + -gen]
progestin or progestin
[C20: from progest(erone) + -o- + -gen]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

progestin pro·ges·tin (prō-jěs'tĭn)

  1. A natural or synthetic progestational substance that mimics some or all of the actions of progesterone.

  2. A crude hormone of the corpus luteum from which progesterone can be isolated in pure form. No longer in technical use.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Hormonal implants, matchstick-sized rods that are placed under the skin surface, emit a progestin type hormone for three years.
All hormonal birth control uses estrogen mixed with progestin or progestin only.
The rod releases into the bloodstream tiny amounts of the hormone progestin.
In such cases, the next step may be to administer estrogen followed by progestin.
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