[ ri-lak-sin ]
/ rɪˈlæk sɪn /

noun Biochemistry, Pharmacology.

a polypeptide hormone produced by the corpus luteum during pregnancy that causes the pelvic ligaments and cervix to relax during pregnancy and delivery.

Origin of relaxin

First recorded in 1925–30; relax + -in2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for relaxin

/ (rɪˈlæksɪn) /


a mammalian polypeptide hormone secreted by the corpus luteum during pregnancy, which relaxes the pelvic ligaments
a preparation of this hormone, used to facilitate childbirth

Word Origin for relaxin

C20: from relax + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for relaxin

[ rĭ-lăksĭn ]


A female hormone secreted by the corpus luteum that helps soften the cervix and relax the pelvic ligaments in childbirth.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.