9 letters · 13 points in Scrabble
noun gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition
originFrom pro- (from Ancient Greek πρό (pró, “before”)) + lact- (variation of lacto-, from Latin lac (“milk”)) + -in (modification of -ine).
Etymology from Wiktionary, CC BY-SA 3.0