magnum
Americannoun
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a large wine bottle having a capacity of two ordinary bottles or 1.5 liters (1.6 quarts).
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a magnum cartridge or firearm.
adjective
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(of a cartridge) equipped with a larger charge than other cartridges of the same size.
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(of a firearm) using such a cartridge.
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Informal. unusually great in power or size.
a magnum spotlight; a magnum dosage.
noun
Etymology
Origin of magnum
1780–90; < Latin, neuter of magnus large; in reference to firearms, originally used as a trademark by the Smith and Wesson Co.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Yet long before earning all these accolades, Shakira was a teen girl in Baranquilla, Colombia, waiting in line at her local record store for a copy of Nirvana’s 1991 grunge magnum opus, “Nevermind.”
From Los Angeles Times • Mar. 18, 2026
After inspecting a gifted magnum of Chinese wine, he stressed that the country "knew how to produce" -- another worry for French producers.
From Barron's • Feb. 9, 2026
Wines that are both good and reasonably priced are not often available in the 1.5-liter magnum size.
From The Wall Street Journal • Dec. 22, 2025
In a landmark event for film lovers, the fully restored, uncut version of Ramesh Sippy's 1975 magnum opus will have its world premiere at Il Cinema Ritrovato Festival in Bologna, Italy, on Friday.
From BBC • Jun. 25, 2025
“I don’t know what a magnum opus is,” said Wilbur.
From "Charlotte's Web" by E.B. White
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
