DICT.TW Dictionary Taiwan

 In·grain a.
 1. Dyed with grain, or kermes. [Obs.]
 2. 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.