oarweed


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Related to oarweed: Laminaria digitata

oarweed

(ˈɔːˌwiːd)
n
(Plants) any of various brown seaweeds, esp a kelp of the genus Laminaria, with long broad fronds, common below the low-water mark
[from earlier oreweed, from wore, from Old English wār seaweed + weed1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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There are a number of types considered edible, including dulse, sea lettuce and oarweed, each with its own distinct flavour, like the different taste qualities of grapes in wine.
Often they contain high amounts of potash, particularly oarweeds or kelps.