Definition of rockweed
: any of various coarse brown algae (order Fucales, especially genera Fucus, Ascophyllum, and Sargassum) growing in marine environments free-floating or attached to rocks
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Recent Examples of rockweed from the Web
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This seaweed struggle, and the fate of A. nodosum itself, hinges on a single question, patently absurd yet bizarrely complex: is rockweed, in defiance of logic and biology, really a fish?
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But rockweed does not fit easily into existing categories.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rockweed.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of rockweed
1583
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