red seaweed

noun
any marine red alga, especially one of the genus Polysiphonia, having a reddish, much branched thallus.

Origin:
1750–60

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World English Dictionary
red seaweed
 
n
another term for red algae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
He makes his mortadella with carrageenan, a gel derived from red seaweed and used for years in toothpastes and puddings.
When disturbed, they seek shelter in sea fans or among red seaweed.
Although demand for red seaweed is strong, traditional services are over picked and production is declining.
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