Gold fell 1.5% Wednesday, its biggest one-day drop in nearly a month, as deflation worries related to a U.S. fiscal crisis and debt-stricken Greece triggered a heavy bout of stop-loss orders from momentum-driven fund investors. After trading slightly lower in Asian dealings, bullion prices suddenly plummeted $25 an ounce at the U.S. pit-session open with an equivalent of more than 2 million ounces of Comex gold futures changing hands in less than