Dulse \Dulse\ (d[u^]ls), n. [Cf. Gael. duileasg; duille leaf + uisge water. Cf. {Whisky}.] (Bot.) A seaweed of a reddish brown color, which is sometimes eaten, as in Scotland. The true dulse is {Sarcophyllis edulis}; the common is {Rhodymenia}. [Written also {dillisk.}] The crimson leaf of the dulse is seen To blush like a banner bathed in slaughter. --Percival.