Where does “aigu” come from?

aigu (Middle French) comes from Old French agu, from Latin acūtus, from Latin acuō, from Latin acus, from Proto-Italic akus, from Proto-Indo-European h₂eḱus, from Proto-Indo-European h₂eḱ- — sharp.

Ancestry of “aigu”, step by step

StepLanguageWordMeaning
1Old Frenchaguneedle
2Latinacūtussharpened, made sharp, sharp, having been sharpened
3Latinacuōto make pointed, sharpen, whet
4Latinacusa needle, a pin; bodkin; bran, awn, chaff
5Proto-Italicakus—
6Proto-Indo-Europeanh₂eḱus—
7Proto-Indo-Europeanh₂eḱ-sharp

Words derived from “aigu”

Every word from Proto-Indo-European h₂eḱ- →Every word from Proto-Indo-European h₂eḱus →Every word from Proto-Italic akus →