GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Tossing, 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]