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aftertreatment

[af-ter-treet-muh nt, ahf-]
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noun
  1. a chemical treatment to which a fabric is subjected immediately after being dyed, for increasing the fastness of the color.

Origin of aftertreatment

First recorded in 1825–35; after + treatment
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018