Definition of blueback
2 [so called from the contrast of the blue ink used on its back to the green ink used on the back of the Northern greenback] archaic : a paper note of Confederate money
3 : a bluish discoloration of the backs of turkeys resulting from dissemination of feather pigment through the skin when immature feathers are broken
4 [so called from the color of the coat] : a young hooded seal
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First Known Use of blueback
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