goldback

plural goldbacks

1. UShistoricalslangA kind of gold certificate with an orange back.

   Synonyms: yellow boy

2. Any member of species Pentagramma triangularis of ferns.
3. Any member of genus Pityrogramma of ferns.

plural Goldbacks

1. A fractional gold commercial product marketed as a local currency and commodity which has seen limited use in some U.S. states, shaped like a banknote but containing a small amount of 24-karat gold.