Irish moss

n.
An edible North Atlantic seaweed (Chondrus crispus) that yields a mucilaginous substance used medicinally and in preparing jellies. Also called carrageen.

A red seaweed, Chondrus crispus; source of the polysaccharide carrageenan.

An Atlantic Coast seaweed; used to make size for paint.

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The noun has one meaning:

Meaning #1: dark purple edible seaweed of the Atlantic coasts of Europe and North America
  Synonyms: carrageen, carageen, carragheen, Chondrus crispus

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