the deposit or sediment of cane-juice that contains yeast left over from making a quantity of rum that is used in the fermentation process in making a new quantity
dunder in American English
(ˈdʌndər)
noun
the thick lees from boiled sugar-cane juice used in the distillation of rum
Word origin
[1785–95; alter. of Sp redundar to overflow]This word is first recorded in the period 1785–95. Other words that entered Englishat around the same time include: breakup, cyclic, depot, edit, plateau