from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation European currency unit

from The Century Dictionary.

  • noun The shield carried by a mounted man-at-arms in the middle ages; especially, the triangular shield of no great length carried during the thirteenth and fourteenth centuries, and hung around the neck by the guige, so as to cover the left arm and left side.
  • noun The name of several gold and silver coins current in France from the fourteenth century onward, having a shield as part of their type: in English usually rendered crown.
  • noun A Scotch gold coin, also called crown, issued in the sixteenth century by James V. and by Mary, Queen of Scots. It was worth at the time of issue 20 shillings English.
  • noun In France, a sum of money, formerly consisting of three francs, now generally of five francs.
  • noun A vegetable tracing-paper, 15x20 inches.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The ISO 3166-1 three-letter (alpha-3) code for Ecuador.
  • initialism European Currency Unit
  • initialism Engine control unit
  • initialism Electronic control unit


Sorry, no etymologies found.



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  • ECU, n.

    The Guardian, 4 October 2015:

    So how did Volkswagen pull it off? Simple: it inserted what programmers would call a “neat hack” into the engine-control unit (ECU) of its cars. The ECU is a purpose-designed computer that controls the engine. (All cars have them nowadays: analogue motoring is so yesterday, don’t you know.) Since 2009, VW’s ECUs have been running software that monitors movements of the steering wheel and pedals.

    October 15, 2015