The Collaborative International Dictionary
dillisk
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.
Wiktionary
dillisk
n. (context chiefly Irish English) dulse.