decanter: A glass container that can hold the contents of an entire bottle of wine; often used to aerate the wine (let it breathe before consuming).

depth: A standard that wine experts use to judge wine quality; indicates a wine that gives the impression of having many layers (rather than being "flat" tasting).

DO: An acronym for Denominação de Origen. DO is Portugal’s highest quality ranking for their wines.

DOC: An acronym for Denominazione di Origine Controllata. DOC is a classification referring to a quality wine produced in Italy.

DOCG: An acronym for Denominazione di Origine Controllata e Garantita. DOCG is a classification relating to a small group of elite (high-quality) wines produced in Italy.

dry: A wine descriptor that refers to a wine that is not sweet. Wines can be classified as dry, off-dry (or semi-sweet), or sweet.