Real Dictionary

prostaglandin in American English
any of a group of hormonelike fatty acids found throughout the body, esp. in semen, that affect blood pressure, metabolism, body temperature, and other important body processes
noun: 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

prostaglandin in British English
noun: 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 bir