"mounds of earth thrown up for some purpose, especially as a military fortification," 1630s, from earth + work (n.). In this sense Old English had eorðbyrig "mound, embankment;" Old English eorðweorc meant "work on the land."
earthling
earthly
earthman
earth-mother
earthquake
earthwork
earthworm
earthy
earwax
Earwicker
earwig
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