Pluto

·noun The son of Saturn and Rhea, brother of Jupiter and Neptune; the dark and gloomy god of the Lower World.

Pluto
Plūto or Plūton, ōnis, m., = Πλούτων, I the king of the Lower World , the husband of Proserpine ,...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.