The euro fell to its lowest level since August last year amid broader gains in the US dollar and oil and the escalation of conflict in the Middle East.
The common European currency weakened by 0.6 percent against the dollar to $1.1435, its lowest level in more than seven months, Bloomberg calculated.
Yesterday, the European Central Bank announced a reference rate for the euro of $1.1547, compared with $1.1581 on Wednesday.
The euro has lost more than 2 percent of its value since the beginning of the year as rising energy prices have heightened concerns about Europe's economic outlook.
The decline is deepened after the US dollar appreciated against all major G-10 currencies today amid ongoing military strikes in the Middle East.
The single European currency depreciated minimally by 0.03 percent against the British pound to 0.8625 euros per pound, and against the Swiss franc the depreciation was 0.33 percent to 0.9028 euros per franc.
The euro was already under pressure as oil prices, which remain above $100 per barrel, once again highlighted the structural vulnerability of the European economy. As energy prices rise, Europe's trade balance deteriorates as the region remains heavily dependent on imported energy resources, putting additional pressure on the currency.