Of or relating to Pluto, the Greek and Roman god of the underworld; demonic, infernal.

(by extension) Of, relating to, or having characteristics associated with the underworld; dark, gloomy; mournful.

Pertaining to the astrological influence of Pluto, formerly regarded as a planet.

Of or relating to the dwarf planet Pluto.

(by extension) Of or pertaining to rocks formed deep in the Earth's crust, rather than by volcanoes at the surface of the Earth.

(by extension) Of, pertaining to, or supporting plutonism.

Containing plutonium in a higher oxidation state.

Containing plutonium in a higher oxidation state.