chlorogenic acid
[ klawr-uh-jen-ik, klohr-, klawr-, klohr- ]
/ ˈklɔr əˈdʒɛn ɪk, ˈkloʊr-, ˌklɔr-, ˌkloʊr- /
noun Biochemistry.
a colorless crystalline acid, C16H18O9, that is important in plant metabolism and is purportedly responsible for the browning or blackening of cut apples, potatoes, and other fruits and vegetables.