köken: From Middle Dutch gruus, from Old French groisse, a Germanic borrowing, from Frankish *greot, ultimately related to *greutą (“grits, coarse grains”).
sandstone · grit (such as for sanding, polishing, or traction)
köken: Ultimately from Middle Chinese 砂岩 (MC srae ngaem, “sandstone”, literally “sand + rock”). Uses the kan'on reading, suggesting a later borrowing. Compare modern Cantonese reading saa¹ ngaam⁴.
köken: Uncertain; possibly a substratum word, akin to Albanian grihë, or derived from Albanian gërresë (“potter's instrument for leveling”). Alternatively, from a Slavic *kresь or *gresь; compare Serbo-Croatian kresalo, kresivo (“flint, tinderbox”), kresati (“light with flint”), kresiti (“set off sparks”).