One of the mysteries of the English language finally explained.
Earthly, of earth.
Mid 16th century; earliest use found in William Tyndale (c1494–1536), translator of the Bible and religious reformer. From earth + -ish. Compare Old Frisian erthisk, ērdsk, Middle Low German ērdesch, ērdisch, Middle Dutch ērtsk (Dutch aards), Old High German irdisc (Middle High German irdisch, erdisch, German irdisch), Old Icelandic jarðesk, Swedish jordisk.
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