yellowback
nounDefinition of yellowback
1
: gold certificate
2
: a cheap and usually sensational novel
especially
: one sold in yellow board or paper covers in the late 19th and early 20th centuries
3
: a freshwater mussel (Lampsilis anodontoides) of the Mississippi valley and southeastern U.S. having a heavy shell covered with yellow periostracum and highly valued for mother-of-pearl
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