fol·lis | \ˈfälə̇s, ˈfȯl-\
plural folles\-äˌlēz, -ȯˌlās \

Definition of follis 

1 : a Roman bronze coin of the late Empire having a silver coating and a very small value

2 : a large bronze coin current in the Byzantine Empire under Anastasius (a.d. 491-518) that was marked with a large M

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History and Etymology for follis

Late Latin, from Latin follis bag

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