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Webster 1913 Edition

Adj.

[Pref.

bi-

metallic

: cf. F.

bimétallique

Of or relating to, or using, a double metallic standard (as gold and silver) for a system of coins or currency.

[archaic]

bimetallic ‎(not comparable)

Pertaining to the use of gold and silver to create legal currency.
- 1908, Arthur Conan Doyle, The Adventure of the Bruce-Partington Plans (Norton 2005), page 1302:
  We well suppose that a Minister needs information as to a point which involves the Navy, India, Canada and the bimetallic question.
More generally, consisting of two metals.

bimetallic ‎(plural bimetallics)