From Middle French astrologie, and its source, Latin astrologia (“astronomy”), from Ancient Greek ἀστρολογία (astrología, “telling of the stars”), from ἄστρον (ástron, “star, planet, or constellation”) + -λογία (-logía, “treating of”), a combination form of -λόγος (-lógos, “one who speaks (in a certain manner)”). Morphologically astro- + -logy.