piastre
noun
pi·as·tre pē-ˈa-stər 
-ˈä-
-ˈä- variants or less commonly piaster
1
: piece of eight
2
a monetary subunit of the pound (Egypt, Lebanon, Syria) see pound at Money Table
Word History
Etymology
French piastre, from Italian piastra thin metal plate, coin, from Latin emplastra, emplastrum plaster
First Known Use
1592, in the meaning defined at sense 1