adjective/ɛɡʁ/
sharp, sour, acid; shrill (voice); biting (wind etc.)
“cerises aigres” — sour cherries
Synonyms: acide
Inherited from Old French aigre, from Vulgar Latin ācrus (possibly via a southern Gallo-Romance dialect), from Latin ācer (with a change in declension), from Proto-Italic *akris, from Proto-Indo-European *h₂eḱrós (“sharp”). Doublet of âcre, which was borrowed from Latin.