Green’s Dictionary of Slang

(US gambling) the point of nine in craps dice.

1965		J. Thompson Texas by the Tail (1994) 6: Joe, of course, is the lowest point on the dice. Above it are [...] , Eighter-Decatur (three [i.e. combinations]), Quinine (a bitter two), Big Dick (two) and the fielders, Heaven-eleven and Boxcars, which have no bearing after the initial roll.
2001		Word for the Wise 31 Aug. [US radio script] A five and a four is called strychnine or quinine, or sometimes Nina from Pasadena. Losing one from Nina from Pasadena yields an Eighter from Decatur.