Launders meaning : A washerwoman or washerman. A trough used by miners to receive powdered ore from the box where it is beaten, or for carrying water to the stamps, or other apparatus for comminuting (sorting) the ore. A trough or channel carrying water to the wheel of a watermill. A gutter (for rainwater). To wash; to wash, and to smooth with a flatiron or mangle; to wash and iron. To lave; to wet. (money) To disguise the source of (ill-gotten wealth) by various means.