noun blue·back \ˈblü-ˌbak\

Definition of blueback

  1. 1 :  any of various fishes (such as lake herring or glut herring) having a blue or bluish color on the back; especially :  blueback herring

  2. 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. 3 :  a bluish discoloration of the backs of turkeys resulting from dissemination of feather pigment through the skin when immature feathers are broken

  4. 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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to criticize severely

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