any of various natural or synthetic steroidal hormones, as progesterone, that cause progestational activity, used in birth control pills, in hormone therapy, etc.
often called pro·ges′to·gen
Origin of progestinpro- + gest(ation) + -in
Any of several synthetic progestational substances that mimic some or all of the actions of progesterone, used as contraceptives either alone or in combination with estrogen, and with estrogen in hormone replacement therapy.
Origin of progestinpro- 1 gest(ation) -in
(countable and uncountable, plural progestins)