Oct 27 (Reuters) - Gold prices slipped on Tuesday, weighed down by a firmer dollar, while investors looked ahead to the Federal Reserve's policy meeting for fresh guidance on the outlook for interest rates. Spot gold eased 0.3% to $4,004.55 per ounce by 0721 GMT, while US gold futures for December delivery dropped 0.5% to $4,017.00. The US dollar held steady near a two-week high, reducing the appeal of greenback-priced bullion for overseas buyers. [USD/]