(France) The rancio style is one of fortification and oxidation, generally achieved by prolonged (decades in some cases) periods of ageing in wood. It is popular in Rivesaltes and Maury.
The desirable aroma of rancid butter and mushrooms, accented by notes of dried fruits and touches of raisins and nuts, that is created by oxidation of fatty acids in the barrel.
A style of wine, usually fortified wine or vin doux naturel, that involves deliberate maderization and/or oxidation. It is made primarily in France and Spain.