• (RP) IPA: /pluːˈtəʊ.nɪ.ən/
• (GA) IPA: /pluˈtoʊ.ni.ən/

Plutonian

1. (Greek mythology, Roman mythology) Of or relating to Pluto, the Greek#Adjective|Greek and Roman#Adjective|Roman god of the underworld; demonic, infernal.

   Synonyms: Plutonic, Plutonical

   • 1674, John Milton, “Book X”, in Paradise Lost. A Poem in Twelve Books, 2nd revised and augmented edition, London: Printed by S[amuel] Simmons […], OCLC 563123917 ↗, page 264 ↗:

     [H]e through the midſt unmarkt, / In ſhew Plebeian Angel militant / Of loweſt order, paſt; and from the dore / Of that Plutonian Hall, inviſible / Aſcended his high Throne, [...]

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

   Synonyms: plutonic

3. (by extension, geology) Synonym of plutonic#English|plutonic (“of or pertaining to rock#Noun|rocks form#Verb|formed deep#Adjective|deep in the Earth's crust#Noun|crust, rather than by volcanoes at the surface#Noun|surface of the Earth”)

   Synonyms: abyssal, intrusive

4. (by extension, geology, historical) Synonym of plutonic#English|plutonic (“of, pertaining to, or support#Verb|supporting plutonism, the theory that the rocks of the Earth were formed in fire#Noun|fire by volcanic activity, with a continuing#Adjective|continuing gradual process#Noun|process of weathering#Noun|weathering and erosion, then deposit#Verb|deposited on the sea bed, reform#Verb|re-formed into layer#Noun|layers of sedimentary rock by heat#Noun|heat and pressure#Noun|pressure, and raise#Verb|raised again”)

• Plutonic
• Plutonical (obsolete)

• French: plutonien
• Italian: plutoniano
• Spanish: plutoniano

• French: plutonien, plutonique
• German: plutonisch
• Italian: plutoniano
• Spanish: plutoniano, plutónico

Plutonian (plural Plutonians)

1. (geology, historical) A proponent of plutonism; a plutonist.

   Antonyms: Neptunian, Neptunist

• French: plutonique

Plutonian (not comparable)

1. (astrology) Pertaining to the astrological influence#Noun|influence of Pluto, formerly regarded as a planet.
2. (astronomy) Of or relating to the dwarf planet Pluto.

• French: plutonien
• Portuguese: plutónio, plutônio (Brazil)
• Spanish: plutoniano

Plutonian (plural Plutonians)

1. (astrology) A person under the astrological influence#Noun|influence of Pluto, formerly regarded as a planet.
2. (chiefly, science fiction) An (imaginary) inhabitant of the dwarf planet Pluto.

• plutonium

• French: Plutonien, Plutonienne
• Spanish: plutoniano, plutoniana