A term applied to the driest (see dry) champagne. Brut Champagnes are drier than those labeled "extra dry." The term extra brut denotes a wine that's extremely (sometimes totally) dry. Totally dry sparkling wines, which aren't slightly sweetened with a small amount of dosage, are also sometimes called brut nature or brut integral.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.