Proto-IE: *gʷerǝu-n-, *gʷr[ā]u-n-
Meaning: millstone
Old Indian: grā́van- m. `stone for pressing out the Soma'
Armenian: erkan `Mühlstein'
Celtic: *gʷrāwō: OIr braō, brō, acc. brōin `Mühlstein, Handmühle'; Cymr breuan, OCorn brou, Bret breo `Mühlstein'
Russ. meaning: жернов
References: WP I 684 f
piet-meaning,piet-ind,piet-arm,piet-slav,piet-balt,piet-germ,piet-celt,piet-rusmean,piet-refer,