Word Study
carrageen
CIDE DICTIONARY
carrageen, n.
A small, purplish, branching, cartilaginous seaweed (Chondrus crispus ), which, when bleached, is the Irish moss of commerce. [1913 Webster]
OXFORD DICTIONARY
carrageen, n. (also carragheen) an edible red seaweed, Chondrus crispus, of the N. hemisphere. Also called Irish moss.
Etymology
orig. uncert.: perh. f. Ir. cos{aacute}in{iacute}n carraige carrageen, lit. 'little stem of the rock'
For further exploring for "carrageen" in Webster Dictionary Online