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
prostaglandin pros·ta·glan·din (prŏs'tə-glān'dĭn) n. 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.
(prŏs'tə-glān'dĭn) 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.