Definition of "magnum opus" []

• A great work, especially a literary or artistic masterpiece. (noun)
• The greatest single work of an artist, writer, or composer. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We are reminded of NICOLAS FLAMEL (1330-1418), who is reputed to have achieved the magnum opus together with his wife PERNELLE, as well as of the many other women workers in the Art of whom we read."
• "His magnum opus was his edition of the Works of Dr. Thomas Reid, left unfinished, and completed by Mansel."
• "His magnum opus entitled The Golden Bough comprises twelve volumes, an index and bibliographical volume, and a volume called Aftermath."