The grainy deposit sometimes found in wine bottles, most often with older wines. Sediment is not a bad sign but in fact may indicate a superior wine. It should be allowed to settle completely before the wine is decanted into another container so that when the wine is served no sediment transfers to the glass.
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.