Definition of Eris in English:

Eris

noun

Astronomy
  • (The name of) a trans-Neptunian dwarf planet orbiting the sun, mostly beyond the orbit of Pluto, and having a mass greater than that of Pluto.

Origin

Early 21st century; earliest use found in Science News. From ancient Greek Ἔρις, the name of the goddess of discord and strife, personification of ἔρις quarrel, strife, of unknown origin.

Pronunciation

Eris

/ˈɛrɪs/