WordNet sense 1 (a plant hormone promoting elongation of stems and roots):

indoleacetic acid

WordNet sense 2 (Yemen-based terrorist group that supports al-Qaeda's goals; seeks to overthrow the Yemeni government and eliminate United States interests; responsible for bombings and kidnappings and killing Western tourists in Yemen):

Islamic Army of Aden, Aden-Abyan Islamic Army, Islamic Army of Aden-Abyan