Where does “grano” come from?

grano (Old Spanish) comes from Latin grānum, from Proto-Italic grānom, from Proto-Indo-European ǵr̥h₂nóm, from Proto-Indo-European ǵr̥h₂nós, from Proto-Indo-European ǵerh₂- — to grow old, to mature.

Ancestry of “grano”, step by step

StepLanguageWordMeaning
1Latingrānumgrain, seed, small kernel
2Proto-Italicgrānomgrain
3Proto-Indo-Europeanǵr̥h₂nómgrain
4Proto-Indo-Europeanǵr̥h₂nósmatured, grown old
5Proto-Indo-Europeanǵerh₂-to grow old, to mature

Words derived from “grano

Every word from Proto-Indo-European ǵerh₂-