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trans-Neptunian

adjective
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\ ¦tran(t)s, -raan-, -nz+ \

Definition of trans-Neptunian

: lying beyond the orbit of the planet Neptune

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History and Etymology for trans-Neptunian

trans- + Neptune, formerly most distant known planet + English -ian

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“Trans-Neptunian.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/trans-Neptunian. Accessed 19 January 2020.

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