"
From the Greek world, Andreas Willi - Morpurgo Davies's Indo-
Europeanist successor in classical philology at Oxford - uses Greek
áphenos "wealth" aphrós "foam" (beside Welsh afon Latin amnis "river")
to trace a preserved "flowing river = affluent prosperity" metaphor (as
in English abundance Latin unda "wave", Greek ploû-tos ~ ple(w)-
o "flow"), built to a convincingly posited IE word for "fast-flowing
river", *h2ebh-r/n-.
"