goldback

Noun

Meaning

A unit of the Goldback currency system containing 1/1000th of a troy ounce of pure gold

(countable, US, slang, historical) A kind of gold certificate with an orange back.
Synonym: yellow boy

The fern Pentagramma triangularis.

Any of various ferns of the genus Pityrogramma.

Goldback (plural Goldbacks)

Alternative letter-case form of goldback

Source: en.wiktionary.org

greenback

Blackdog