Weissbier means “white beer” in German. The name derives from the yellowish-white tinge that is imparted by the pale malted wheat from which the brew is made. In North America, the brew is more commonly called Hefeweizen (literally "yeast wheat"), because it is unfiltered, meaning the yeast remains in suspension and causes the beer to look slightly turbid. Filtered, clear Weissbier, incidentally, is called Kristallweizen ("crystal wheat"). There are also dark wheat beers. These are called Dunkelweizen ("dark wheat").