The word has been applied to various wines through time, but generally they are sweet Madiera dessert wines. The variety was originally specifically crafted from malvasia grapes on Madiera, the Canary Islands or other Mediterranean regions but now the term is loosely applied to similar wines produced in other regions - often with other grape cultivars.
► uses
Uses:
"The Madeira wine of this country is equal to any in the world, but it is only at some of the opulent farmers' houses that it is to be got of the best. This quality is as superior to Constantia as Constantia is to common Malmsey. The different kinds of grape produce many sorts of wine, so that little can be known of them under the common term Cape Wine.
Ida Lee. Captain Bligh's Second Voyage to the South Sea (1920)
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her soul sank into this drunkenness, shrivelled up, drowned in it, like Clarence in his butt of Malmsey.
Gustave Flaubert. Madame Bovary.
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He had suspicions of his father, the Duke of Wellington. Well, what did he do? Ask him to show up? No—drownded him in a butt of mamsey, like a cat.