köken: Inherited from Middle French aigu, agu, from Old French agu, from Latin acūtus (“sharp”); related to English acute. The original Old French result was eü (preserved in the toponym Montheu < Latin Mons acutus (“sharp mountain”)), which was likely modified into the form agu based on the Latin, and then influenced by words like aigre, or aiguiser, as with aiguille. Doublet of acut.