- ecu⇄ecu orECU, noun.
a money of account in the European Common Market, that is a standard in floating currencies within a narrow range. - ecu⇄ecu, noun, pl.ecus.
(French.)
1. the short, triangular shield carried by a mounted soldier in the Middle Ages.
2. any of several French gold or silver coins issued from the 1200's on, especially the silver five-franc piece.