(Australia) A venomous spider, Latrodectus hasselti, endemic to Australia.
1988 June 16, Stephanie Pain, Things that go plop in the night, New Scientist, page 78,
“If you find a redback, squash it firmly,” advised one guide.
2005 October, Martha Harrison, Brilliant 10: Marydianne Andrade, Popular Science, page 58,
Andrade first encountered the redback— whose lethal bite gives it as infamous a reputation in Australia as the black widow enjoys here in North America—when her grad-school adviser asked to travel to go to Perth to study them.
(US) A brown and white sandpiper (Calidris alpina), native to the Northern Hemisphere; the dunlin.
noun
(slang) the yuan (CNY), the currency of the People's Republic of China (Red Chinese money)