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