Short version of Euro rate' Diff'erential, which is a Chicago Mercantile Exchange Futures contract that is founded on the interest rate spread between the U. S. Dollar and the British pound, the German mark, or the Japanese yen.
Diff and Differencing
(p.pr.&vb.n.) of Difference.
Webster's Revised Unabridged Dictionary
Subtracting previous from current values to obtain a stationary (detrended) time series: P stationary = Pt - Pt-1.