noun Pharmacology.
Also, progestagen.

1940–45; pro-1 + gest(ation) + -o- + -gen 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

progestogen pro·ges·to·gen (prō-jěs'tə-jən)
Any of various substances having progestational effects; a progestin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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