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relaxin

[ri-lak-sin] /rɪˈlæk sɪn/
noun, Biochemistry, Pharmacology
1.
a polypeptide hormone produced by the corpus luteum during pregnancy that causes the pelvic ligaments and cervix to relax during pregnancy and delivery.
Origin
1925-1930
1925-30; relax + -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for relaxin

relaxin

/rɪˈlæksɪn/
noun
1.
a mammalian polypeptide hormone secreted by the corpus luteum during pregnancy, which relaxes the pelvic ligaments
2.
a preparation of this hormone, used to facilitate childbirth
Word Origin
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
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relaxin in Medicine

relaxin re·lax·in (rĭ-lāk'sĭn)
n.
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.
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Encyclopedia Article for relaxin

a hormone produced by the ovaries during pregnancy that causes pelvic and cervical expansion and relaxation. It inhibits muscular contractions of the uterus that would cause natural abortion of the developing child, stimulates the growth of the glands in the breasts that are responsible for milk production, and increases the amount of water in the uterus. The hormone is found only in pregnant females, and its activities last only for 24 hours after birth.

Learn more about relaxin with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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