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oxytocin

[ok-si-toh-suh n] /ˌɒk sɪˈtoʊ sən/
noun
1.
Biochemistry. a polypeptide hormone, produced by the posterior lobe of the pituitary gland, that stimulates contraction of the smooth muscle of the uterus.
2.
Pharmacology. a commercial form of this substance, obtained from beef and hog pituitary glands or especially by synthesis, and used chiefly in obstetrics to induce labor and to control postnatal hemorrhage.
Origin of oxytocin
1925-1930
1925-30; oxytoc(ic) + -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for oxytocin

oxytocin

/ˌɒksɪˈtəʊsɪn/
noun
1.
a polypeptide hormone, secreted by the pituitary gland, that stimulates contractions of the uterus or oviduct and ejection of milk in mammals; alphahypophame: used therapeutically for aiding childbirth. Formula: C43H68N12O12S2 Compare vasopressin
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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oxytocin in Medicine

oxytocin ox·y·to·cin (ŏk'sĭ-tō'sĭn)
n.
A short polypeptide hormone that is released from the posterior lobe of the pituitary gland and stimulates the contraction of smooth muscle of the uterus during labor and facilitates release of milk from the breast during nursing.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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oxytocin in Science
oxytocin
  (ŏk'sĭ-tō'sĭn)   
A polypeptide hormone secreted by the posterior portion of the pituitary gland. Oxytocin stimulates the contraction of smooth muscle of the uterus during childbirth and facilitates ejection of milk from the mammary glands.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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