Etymology
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earthman (n.)

also earth-man, 1860, "a spirit of nature; a demon who lives below the ground," from earth (n.) + man (n.). Science fiction sense of "inhabitant of the planet Earth" first attested 1949 in writing of Robert Heinlein.

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Definitions of earthman

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