relaxin

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re·lax·in

(rē-lak'sin),
A polypeptide hormone secreted by the corpora lutea of mammalian species during pregnancy. Facilitates the birth process by causing a softening and lengthening of the pubic symphysis and cervix; it also inhibits contraction of the uterus and may play a role in timing of parturition.
[relax + -in]
Farlex Partner Medical Dictionary © Farlex 2012

relaxin

(rĭ-lăk′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® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

re·lax·in

(rĕ-lak'sin)
Polypeptide hormone secreted by the corpora lutea of mammalian species during pregnancy; facilitates birth process by softening and lengthening the pubic symphysis and cervix.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

relaxin

A polypeptide found in the corpus luteum of various mammals that softens the neck of the womb (cervix) and relaxes the pubic joint of the pelvis to ease childbirth. Relaxin has not been proved to occur in humans.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005