tinc·to·ri·al \(ˈ)tiŋk|tōrēəl\adjective Etymology: Latin tinctorius of or relating to dipping (from tinctus, past participle + -orius -ory) + English -al : of or relating to colors or to dyeing or staining : imparting a color < has the greatest opacity and tinctorial strength of all white pigments — Andries Voet > • tinc·to·ri·al·ly\-ēəlē\adverb