An offshoot of oak ageing. Oak casks are usually charred inside, and this may present itself in the wine as the flavour of warm toast or on the nose as just overdone white toast.
A flavor imparted by the oak of barrels and the "toast" level of the barrels (barrels are put over a fire to give the inside a light, medium or heavy toast).
Describes a flavour derived from oak. Also a character that develops in some sparkling wines.