magnum opus Hear it!

magnum opus definition

mag·num opus (mag′nəm ō′pəs)

  1. a great work, esp. of art or literature; masterpiece
  2. a person's greatest work or undertaking

Etymology: L

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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