"tellurian : (formal or literary) Of or relating to the earth; (specifically, chiefly science..."

“tellurian : (formal or literary) Of or relating to the earth; (specifically, chiefly science fiction) inhabiting planet Earth as opposed to other planets.
(mineralogy) Of a mineral: containing tellurium.
The September equinox occurs on this day in 2019, according to UTC.”

- https://en.wiktionary.org/wiki/tellurian#English

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