Where does “aigrun” come from?

aigrun (Old French) comes from Medieval Latin acrumen, from Latin acer, from Proto-Italic akris, from Proto-Indo-European *h₂eḱrós, from Proto-Indo-European h₂eḱ- — sharp.

Ancestry of “aigrun”, step by step

StepLanguageWordMeaning
1Medieval Latinacrumen—
2Latinacersharp, sour, bitter, pungent; keen, sharp, acute,...
3Proto-Italicakrissharp; sour-tasting
4Proto-Indo-European*h₂eḱróssharp
5Proto-Indo-Europeanh₂eḱ-sharp

Words derived from “aigrun”

Every word from Proto-Indo-European h₂eḱ- →Every word from Proto-Indo-European *h₂eḱrós →Every word from Proto-Italic akris →