Etymology
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earthling (n.)

Old English yrþling "plowman" (see earth (n.) + -ling); the sense of "inhabitant of the earth" is from 1590s and might be a re-formation, as the word seems to be missing in Middle English. Compare earthman. Earlier in this sense was earthite (1825).

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Definitions of earthling

earthling (n.)
an inhabitant of the earth;
Synonyms: tellurian / earthman / worldling
From wordnet.princeton.edu