bi·me·tal·lic /ˌbaɪməˈtælɪk/
  (a.)二金屬的,複本位制的
  Bi·me·tal·lic a.
  1. Of or relating to, or using, a double metallic standard (as gold and silver) for a system of coins or currency. [archaic]
  2. Composed of two different metals; formed of two parts, each of a different metal; as, bimetallic wire; bimetallic thermometer, etc.
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  bimetallic
       adj 1: pertaining to a monetary system based on two metals; "in a
              bimetallistic system both gold and silver can
              constitute legal tender" [syn: bimetallistic]
       2: formed of two different metals or alloys; especially in
          sheets bonded together [syn: bimetal]