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The Collaborative International Dictionary of English v.0.48:

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]