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The euro fell 0.4 percent to $1.2782, its lowest level since Sept 11, and breaking below a reported option barrier at $1.2800. Traders cited stop-loss sell orders below $1.2780.
The euro also fell to a one-month low against sterling of 79.855 pence.
The dollar index rose 0.2 percent to 80.755, rising past its 200-day moving average 80.672 to a two-month high. The dollar also rose to a near two-month high against the Swiss franc of 0.94385 francs.