from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a group of potent hormonelike substances that are produced in various mammalian tissues, are derived from arachidonic acid, and mediate a wide range of physiological functions, such as control of blood pressure, contraction of smooth muscle, and modulation of inflammation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a group of naturally occurring lipids derived from the C20 acid prostanoic acid; they have a number of physiological functions and may be considered to be hormones.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a potent substance that acts like a hormone and is found in many bodily tissues (and especially in semen); produced in response to trauma and may affect blood pressure and metabolism and smooth muscle activity
prosta(te) + gland1 + -in.(American Heritage® Dictionary of the English Language, Fourth Edition)
From German Prostaglandin, corresponding to prosta(te) + gland + -in (because it was originally believed to be secreted from the prostate). (Wiktionary)