crown cap
A cap, resembling that on a beer bottle, that is used during bottle fermentation when making sparkling wine via méthode champenoise. The crown cap has a small plastic receptacle attached to it that fits inside the bottle, into which the yeast sediment settles during the riddling process.
The New Wine Lovers Companion, 2nd Edition, by Ron Herbst and Sharon Tyler Herbst. Copyright © (1) 2003, 1995 by Ron Herbst and Sharon Tyler Herbst. Reprinted by arrangement with Barron's Educational Series, Inc.