出典:Wiktionary

Borrowed from French gros-grain (“coarse grain, a strong fabric”), from gros (“coarse”) + grain (“grain”) (ultimately from Proto-Indo-European *ǵerh₂- (“to grow old, mature”)).[1] The word is a doublet of grosgrain which was borrowed later.
grogram (countable かつ uncountable, 複数形 grograms)