Tang \Tang\ (t[a^]ng), n. [Of Scand. origin; cf. Dan. tang seaweed, Sw. t[*a]ng, Icel. [thorn]ang. Cf. {Tangle}.] (Bot.) A coarse blackish seaweed ({Fuscus nodosus}). --Dr. Prior. [1913 Webster] {Tang sparrow} (Zool.), the rock pipit. [Prov. Eng.] [1913 Webster]