The Collaborative International Dictionary of English v.0.48:
Tabby \Tab"by\, a. 1. Having a wavy or watered appearance; as, a tabby waistcoat. --Pepys. [1913 Webster] 2. Brindled; diversified in color; as, a tabby cat. [1913 Webster] Tabby moth (Zool.), the grease moth. See under Grease. [1913 Webster]