A superior, non-human entity of natural or supernatural origin that is indigenous to planet Earth.
UFO's, fairies and elves are believed by some paranormal researchers to be Ultraterrestrials.
by Archangel the Stylish August 3, 2008
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- It doesn't make any sense, how can they summon those demon-monsters from thin air in Buffy the Vampire Slayer?

- Well, I guess they are some kind of Ultraterrestrial entities that pop in from another dimension...
by RedMattis March 19, 2010
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A living creature from another reality/dimension/plane of existence. An extra-dimensional being.
"An ultraterrestrial life form stepped through the glowing rift in space-time."
by ThePsychoSmurf September 23, 2020
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