Carrigeen, Carrageen n. (Also written carragheen, carageen) A small, purplish, branching, cartilaginous seaweed (Chondrus crispus), which, when bleached, is the Irish moss of commerce.
... Irish moss (carrageen) Edible North Atlantic seaweed (Chondrus crispus) that yields a mucilaginous substance used medicinally and ... — Mother's Remedies - Over One Thousand Tried and Tested Remedies from Mothers - of the United States and Canada • T. J. Ritter