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developing-out paper

[dih-vel-uh-ping out, -vel-]
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noun Photography.
  1. a sensitized printing paper requiring development in order to bring out the image. Abbreviation: D.O.P.
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Origin of developing-out paper

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018