Dow opens slide

NEW YORK (Reuters) - Stocks tumbled at the open on Wednesday as mounting concern that the global economy is hurtling toward recession, diminishing investors' appetite for risk and sending world markets lower.

Uncertainty about the profit outlook weighed on sentiment despite more signs that the costs for banks to borrow from each other continued to fall.

The Dow Jones industrial average slid 206.85 points, or 2.29 percent, to 8,826.81. The Standard & Poor's 500 Index tumbled 21.25 points, or 2.23 percent, to 933.80. The Nasdaq Composite Index declined 25.94 points, or 1.53 percent, to 1,670.74.