Where does “*batu” come from?
*batu (Proto-Eastern Malayo-Polynesian) comes from Proto-Central-Eastern Malayo-Polynesian *batu, from Proto-Malayo-Polynesian batu, from Proto-Austronesian *batux — rock; stone.
*batu (Proto-Eastern Malayo-Polynesian) comes from Proto-Central-Eastern Malayo-Polynesian *batu, from Proto-Malayo-Polynesian batu, from Proto-Austronesian *batux — rock; stone.