The Dom is the “ball” (actually the gallbladder of a goat) used in playing Aingingein, a predecessor of the game of Quidditch. It may or may not have actually been an enchanted object (QA2).
Commentary
Etymology
domlas is the Irish Gaelic word for a "gall bladder" (Teanglann New Irish-English Dictionary).
From the Web
Harry Potter Wiki: Dom
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Tags: balls games goats history old Quidditch history sports wizard games