Biochemistry. any of a class of unsaturated fatty acids that are involved in the contraction of smooth muscle, the control of inflammation and body temperature, and many other physiological functions.
Pharmacology. any commercial preparation of this substance.

1935–40; prosta(te) + gland1 + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prostaglandin (ˌprɒstəˈɡlændɪn)
any of a group of potent hormone-like compounds composed of essential fatty acids and found in all mammalian tissues, esp human semen. Prostaglandins stimulate the muscles of the uterus and affect the blood vessels; they are used to induce abortion or birth
[C20: from prosta(te) gland + -in; it was originally believed to be secreted by the prostate gland]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

prostaglandin pros·ta·glan·din (prŏs'tə-glān'dĭn)
Any of a group of hormonelike substances produced in various tissues that are derived from amino acids and mediate a range of physiological functions, such as metabolism and nerve transmission.

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
prostaglandin   (prŏs'tə-glān'dĭn)  Pronunciation Key 
Any of a group of substances that are derived from fatty acids and have a wide range of effects in the body. Prostaglandins influence the contraction of the muscles lining many internal organs and can lower or raise blood pressure.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In humans, these enzymes are part of the pathway that produces prostaglandins, which have a role in inflammation.
These drugs block prostaglandins, the substances that dilate blood vessels and cause inflammation and pain.
They block prostaglandins, the substances that dilate blood vessels and cause inflammation and pain.
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