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.
- sharp, pointy
- (of intelligence) acute, keen, discerning
- (of sound) sharp, loud and high-pitched
- (medicine) acute
- (mathematics, of an angle) acute
- (linguistics, of an accent) acute
- “aigu” in Trésor de la langue française informatisé (The Digitized Treasury of the French Language).
Declension of aigu