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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   gallium
       n 1: a rare silvery (usually trivalent) metallic element;
            brittle at low temperatures but liquid above room
            temperature; occurs in trace amounts in bauxite and zinc
            ores [syn: gallium, Ga, atomic number 31]