Plural of diobol; multiple ancient Greek coins each worth two obols.
From Greek 'diobolos' (via Latin) + English plural suffix '-s,' a standard English pluralization of the numismatic term.
This is the more fully anglicized plural form compared to 'diobolons'—it shows English doing what it does best, taking foreign nouns and just slapping an '-s' on the end, eventually dropping the Greek endings that would make real Greeks recognize the word.
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