Definitions of alloy:

• noun:   a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten

  Example: "Brass is an alloy of zinc and copper"

• noun:   the state of impairing the quality or reducing the value of something
• verb:   make an alloy of
• verb:   lower in value by increasing the base-metal content