The Collaborative International Dictionary
Triple ingrain carpet
Ingrain \In"grain`\ (?; 277), a. [Pref. in- in + grain kermes. See Engrain, Grain.]
Dyed with grain, or kermes. [Obs.]
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Dyed before manufacture, -- said of the material of a textile fabric; hence, in general, thoroughly inwrought; forming an essential part of the substance.
Ingrain carpet, a double or two-ply carpet.
Triple ingrain carpet, a three-ply carpet.