Where does “κορνφλάουρ” come from?

κορνφλάουρ (Greek) comes from English cornflour, from English corn, from Middle English corn, from Old English corn, from Proto-West Germanic korn, from Proto-Germanic kurną, from Proto-Indo-European ǵr̥h₂nóm, from Proto-Indo-European ǵr̥h₂nós — to grow old, to mature.

Ancestry of “κορνφλάουρ”, step by step

StepLanguageWordMeaning
1EnglishcornflourA very fine starch powder derived from corn (maize) used in cooking as a thickener, to keep things from sticking, or as an anti-caking agent
2EnglishcornThe main cereal plant grown for its grain in a...
3Middle EnglishcornAny plant that bears grain, especially wheat; a...
4Old Englishcorncorn, a grain or seed; a cornlike pimple, a corn...
5Proto-West Germanickorncorn, grain, cereal
6Proto-Germanickurnącorn, grain, cereal
7Proto-Indo-Europeanǵr̥h₂nómgrain
8Proto-Indo-Europeanǵr̥h₂nósmatured, grown old
9Proto-Indo-Europeanǵerh₂-to grow old, to mature
Every word from Proto-Indo-European ǵerh₂-