In Mexico, adobo is a dark red, fairly piquant sauce (or paste) made from ground chiles, herbs and vinegar. It's used as a marinade as well as for a cooking and serving sauce. Chipotle chiles are often marketed packed in adobo sauce. Adobo also describes a stewlike presentation of meat prepared in this sauce. The word adobado is used as an adjective for dishes that are prepared in this manner.
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.