oxytocin

[ok-si-toh-suhn]
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:
1925–30; oxytoc(ic) + -in2

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World English Dictionary
oxytocin (ˌɒksɪˈtəʊsɪn)
 
n
Compare vasopressin 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

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
oxytocin   (ŏk'sĭ-tō'sĭn)  Pronunciation Key 
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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Encyclopedia Britannica
Encyclopedia

oxytocin

hormone used clinically to help begin or to continue labour, to control bleeding following delivery, and to stimulate the secretion of breast milk. Oxytocin was first synthesized (along with the related antidiuretic hormone [ADH]) by Vincent du Vigneaud in 1953, and he received the Nobel Prize for Chemistry in 1955 for this work. Synthetic oxytocin has since become widely used in obstetric practice.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Another is that inequality impairs the production of a second hormone, oxytocin.
Oxytocin is a hormone that promotes a feeling of connection, bonding.
Studies show that when petting a dog, a hormone called oxytocin kicks into high gear.
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