Source : Webster's Revised Unabridged Dictionary (1913)

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.