The wikipedia article mentions your 1st point (that it was used elsewhere) but then continues to say that when the original text was reexamined it was found that it was a different word.
>However, after the papyrus containing the shopping list, missing for many years, was rediscovered at the Yale Beinecke Library in 1998,[21] a re-examination found "elaiou" (oil), not "epiousios." (The original transcriber, A. H. Sayce, was apparently known to be a poor transcriber.)
>However, after the papyrus containing the shopping list, missing for many years, was rediscovered at the Yale Beinecke Library in 1998,[21] a re-examination found "elaiou" (oil), not "epiousios." (The original transcriber, A. H. Sayce, was apparently known to be a poor transcriber.)