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A female hormone secreted by the corpus luteum that helps soften the cervix and relax the pelvic ligaments in childbirth.
1. (Biochemistry) a mammalian polypeptide hormone secreted by the corpus luteum during pregnancy, which relaxes the pelvic ligaments
2. (Pharmacology) a preparation of this hormone, used to facilitate childbirth
[C20: from relax + -in]
a polypeptide hormone, produced by the corpus luteum during pregnancy, that causes the pelvic ligaments and cervix to relax during pregnancy and delivery.
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|Noun||1.||relaxin - hormone secreted by the corpus luteum during the last days of pregnancy; relaxes the pelvic ligaments and prepares the uterus for labor|