where did the word DOLLAR originate

Many suggestions have been made about the origin of the dollar symbol $, one of the commonest being that it derives from the figure 8, representing the Spanish 'piece of eight'. However, it actually derives from a handwritten 'ps', an abbreviation for 'peso' in old Spanish-American books. The $ symbol first occurs in the 1770s, in manuscript documents of English-Americans who had business dealing with Spanish-Americans, and it starts to appear in print after 1800. The name 'dollar', however, derives from the Dutch or Low German word daler (in German taler or thaler) - originally Joachimstaler, referring to a coin from the silver mines of Joachimstal, in Bohemia (now Jáchymov in the Czech Republic), which opened in 1516. Source: http://www.askoxford.com/asktheexperts/faq/aboutsymbols/dollarsign?view=uk