Eris

noun
\ˈer-is \

Definition of Eris 

: a dwarf planet with a mean distance from the sun of 67 astronomical units (6.2 billion miles) and a diameter of 1500 miles (2400 kilometers)

First Known Use of Eris

2006, in the meaning defined above

History and Etymology for Eris

Eris, ancient Greek goddess of strife

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Time Traveler for Eris

The first known use of Eris was in 2006

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