13 letters · 17 points in Scrabble
noun 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
originFrom German Prostaglandin. Equivalent to prosta(te) + gland + -in. So called because it was originally believed to be secreted by the prostate.
Etymology from Wiktionary, CC BY-SA 3.0