Proto-IE: *(a)lāw- (Ge ha-)
Meaning: flooring, ground, threshing-floor
Old Greek: hálōs, gen. -ō 'threshing-floor; disk (later: halo) of sun or moon'; alōǟ́ Hom., Hes., Opp. 'threshing-floor; halo (of sun or moon)'
Russ. meaning: настил; площадка, гумно
References: WP II 407 f