whiteback

nounB2

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noun

Plural noun:

whitebacks

1.
Various species that have a white back, including:
2.
(countable, uncountable)A type of paperboard used in packaging that has a smooth white surface on one side and a brown or unbleached surface on the other side.
3.
(attributive, uncountable)(uncountable, chiefly attributive) A type of denim that is indigo on one side, and pale on the back.
4.
(countable, humorous, uncountable)A white immigrant, especially one moving to or from the United States.

From white + back.