What is the meaning of Piastre?

A coin and unit of currency, originally a Spanish or Spanish-American one worth eight real, later also used (with various values) in the Ottoman Empire and in Cyprus, in the French-speaking parts of Canada, and in French Indochina.

A form of currency currently used as a subunit in the Middle Eastern and East African countries of Egypt, Jordan (partly including Palestine), Lebanon, South Sudan, Sudan, and Syria.

A dollar.

piastre (one of several historical units of currency)

buck (a Canadian or American dollar)

plural of piastra

Source: wiktionary.org