transneptunian

Nep·tu·ni·an

[nep-too-nee-uhn, -tyoo-]
adjective
1.
pertaining to Neptune or the sea.
2.
pertaining to the planet Neptune.
3.
(often lowercase) Geology. formed by the action of water.

Origin:
1650–60; Neptune + -ian

trans-Nep·tu·ni·an, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
Neptunian (nɛpˈtjuːnɪən) [Click for IPA pronunciation guide]
 
adj
1.  of or relating to the Roman god Neptune or the sea
2.  of, occurring on, or relating to the planet Neptune
3.  geology (of sedimentary rock formations such as dykes) formed under water

Collins English Dictionary - Complete & Unabridged 10th Edition
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Transneptunian is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
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