Tossing \Toss"ing\, n.
1. The act of throwing upward; a rising and falling suddenly;
a rolling and tumbling.
[1913 Webster]
2. (Mining)
(a) A process which consists in washing ores by violent
agitation in water, in order to separate the lighter
or earthy particles; -- called also {tozing}, and
{treloobing}, in Cornwall. --Pryce.
(b) A process for refining tin by dropping it through the
air while melted.
[1913 Webster]