冥王星(めいおうせい)

めいおうせい
noun
Pluto (dwarf planet)
1. Pluto (dwarf planet)
A dwarf planet beyond Neptune, classified as a planet until 2006 when it was reclassified as a dwarf planet (準惑星(じゅんわくせい)).
冥王星(めいおうせい)は準惑星(じゅんわくせい)に分類(ぶんるい)された。
Pluto was reclassified as a dwarf planet.
昔(むかし)は冥王星(めいおうせい)も太陽系(たいようけい)の惑星(わくせい)だった。
Pluto used to be one of the planets in the solar system.
冥王星(めいおうせい)は二〇〇六年(にせんろくねん)に惑星(わくせい)の定義(ていぎ)から外(はず)された。
Pluto was removed from the definition of a planet in 2006.

Named after Pluto, Roman god of the underworld — written with 冥(めい) (underworld/dark) + 王(おう) (king) + 星(せい) (planet). Now formally a 準惑星(じゅんわくせい) (dwarf planet) rather than a full planet.

COMMON COLLOCATIONS:

  • 冥王星(めいおうせい)の衛星(えいせい): Pluto's moons
  • 冥王星(めいおうせい)の発見(はっけん): the discovery of Pluto
  • 冥王星(めいおうせい)を探査(たんさ)する: to explore Pluto

SIMILAR WORDS:

  • 準惑星(じゅんわくせい): dwarf planet — the official category that Pluto now belongs to
  • 太陽系(たいようけい): solar system
general
Added 2026.6.5 11:07
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