ARGENTEUIL, a town of northern France, in the depart ment of Seine-et-Oise, on the Seine, 5m. north-west of the forti fications of Paris. Pop. (1931) 70,378. Argenteuil grew up round a monastery (A.D. 656), which Charlemagne changed into a nun nery; it was afterwards famous for its connection with Heloise (see ABELARD), and on her expulsion in 1129 was again turned into a monastery. It is a residential area related to Paris, having mar ket gardens and vineyards. The Fête des Vendanges held in au tumn is well known. Machine and chemical industries are carried on and articles de luxe are made.