Proto-IE: *prost- (-sth-)
Meaning: plain, flat
Old Indian: prastha- m.n. `table-land on top of a mountain; plain'
Celtic: *hross-
Russ. meaning: равнина, ровный
References: WP II 603 f
Comments: Possibly < *pro-sth-o- (see *stā-)
piet-meaning,piet-ind,piet-slav,piet-balt,piet-celt,piet-rusmean,piet-refer,piet-comment,