woods-metal

Wood's metal

noun Trademark.
a fusible alloy of 50 percent bismuth, 25 percent lead, 12.5 percent tin, and 12.5 percent cadmium; melts at 158°F (70°C): used in the valves of sprinkler systems.
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WordNet
wood's metal

noun
a fusible alloy that is half bismuth plus lead, tin, and cadmium; melts at about 160 degrees Fahrenheit 
WordNet® 3.0, © 2006 by Princeton University.
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