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The common name for a variety of plants growing between the high water mark and the depths of the sea.
These formed an important part of the prehistoric diet, and continued to be important for families living near rocky coasts, right up to the end of medieval times. The dulse, carageen and laver varieties, in particular, were often added to pottage.
From the mid 1960"s various seaweeds have been farmed, and the algimates extracted used in convenience foods, such as ice cream, - as well as in animal feed (the natural colouring of egg yolks) and toothpaste. See 'Carageen'; 'Dulse'; 'Laver'