[ yel-oh-bak ]
/ ˈyɛl oʊˌbæk /
(formerly) an inexpensive, often lurid, novel bound in yellow cloth or paper.
a gold certificate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for yellowback
You saw what that fellow flashed, a twenty dollar yellowback, a word to Skippy and the Kennedy would follow.Skippy Bedelle|Owen Johnson