Relating to the Abbasid dynasty or the coins and currency of the Abbasid era.
From the name 'Abbas' with the adjectival suffix '-i' common in Arabic and Persian. This adjective form developed alongside the noun to describe anything associated with the Abbasid Empire.
The '-i' ending is Arabic's favorite adjectival suffix—add it to almost any name and you get 'of or relating to'—which is why we have so many words ending in '-i' borrowed from Middle Eastern history and culture.
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