REDBACK
Etymology 1
Noun
redback (plural redbacks)
(Australia) A venomous spider, Latrodectus hasselti, endemic to Australia.
(US) A brown and white sandpiper, Calidris alpina, native to the Northern Hemisphere; the dunlin.
Synonyms
• (Latrodectus hasselti): redback spider
• (Calidris alpina)
Etymology 2
Modelled after greenback, the currency of the United States of America, except using Communist Red
Noun
redback (plural redbacks)
(slang) the yuan (CNY), the currency of the People's Republic of China (Red Chinese money)
Coordinate terms
• red chip
Source: Wiktionary
Red"back` (rd"bk`), n. (Zoöl.)
Definition: The dunlin. [U. S.]
Source: Webster’s Unabridged Dictionary 1913 Edition