rockweed

[rok-weed]
noun
a fucoid seaweed growing on rocks exposed at low tide.

Origin:
1620–30; rock1 + weed1

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Collins
World English Dictionary
rockweed (ˈrɒkˌwiːd)
 
n
any of various seaweeds that grow on rocks exposed at low tide

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Tightly seal the live lobster in a one-gallon plastic zippered freezer bag, along with rockweed if you have it.
Enormous drifting mats of rockweed indicate that here is a great whirling eddy.
Information regarding the effects of rockweed harvesting on eider brood-rearing and feeding habitat is lacking.
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