Coming from or belonging to regions beyond Earth; otherworldly or extraterrestrial.
From 'extra-' (outside) + 'terrene' (from Latin terrena, earthly things). This poetic and archaic variant appeared in 18th-19th century literature alongside the more common 'extraterrestrial.'
This is the fancy, old-fashioned way to say 'alien'—Shakespeare-era scholars would've used this to describe something not of this earthly realm, making it sound mysterious and grand.
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