Plural of diobolon; multiple ancient Greek coins each worth two obols.
From Greek 'diobolon' + English plural suffix '-s,' forming the regular English plural of the Greek loanword.
When English borrows from ancient languages, the plural can be tricky—you could say 'diobols' or 'diobolons,' and scholars sometimes use both, showing how loanwords gradually get anglicized through multiple possible plural forms until one wins out.
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