ECU Definition
 ā-kyo͝o 
  ecus, ecu
  
    abbreviation
  
 European currency unit.
 American Heritage 
European Currency Unit.
 Wiktionary 
Engine control unit.
 Wiktionary 
Electronic control unit.
 Wiktionary 
    noun
  
 A money of account of the European Community through 1998
 Webster's New World 
Any of various French silver or gold coins, esp. a silver crown of the 17th-18th cent.
 Webster's New World 
    pronoun
  
 (law) Abbreviation of Ecuador.
Wiktionary 
Origin of ECU
-  
French from Old French escu from Latin scūtum shield (from the shield stamped on the coin) skei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 
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