Where does “νερό” come from?

νερό (Greek) comes from Byzantine Greek νερόν, from Ancient Greek νηρός, from Ancient Greek νεαρός, from Proto-Indo-European newr̥ós, from Proto-Indo-European néwos, from Proto-Indo-European new- — new; to nod, assent to.

νερό (Greek): water; glass / bottle of water; water bill