rock-weed

rockweed

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

Origin:
1620–30; rock1 + weed1

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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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