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bipack

[bahy-pak] /ˈbaɪˌpæk/
noun, Photography
1.
two separate films, each having an emulsion layer sensitive to a different color, held together with their emulsion layers facing for simultaneous exposure through the back of one.
Origin
1920-1925
1920-25; bi-1 + pack1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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