black rockweed
- noun
- US
:
alga negra
- The harvesters collected black rockweed from the tidal rocks early in the morning.
Examples
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The nutrient-rich black rockweed is also used in preparing kelp products.
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Farmers often use black rockweed as a natural fertilizer.
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Farmers sometimes spread black rockweed over their fields as a natural fertilizer.
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The black rockweed grows abundantly along the coast.
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Farmers sometimes spread black rockweed over their fields as a natural fertilizer.
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The nutrient-rich black rockweed is also used in preparing kelp products.
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The harvesters collected black rockweed from the tidal rocks early in the morning.
Synonyms
1
9.1
A brown seaweed that grows on rocky coasts and is used as fertilizer or food
1
9.0
A rough brown seaweed that grows on rocks at low tide
A brown seaweed with small air bladders that people use as garden fertilizer
A common brown seaweed that grows on northern coasts and is used as fertilizer
A common brown seaweed with small air pockets that grows on rocky shores
A large brown seaweed that grows on North Atlantic coasts and is used as plant food and feed for animals
How Common
Surface Forms
Morphology
This is a straightforward adjective + noun combination: 'black' (a color) modifies 'rockweed' (a type of seaweed), so the meaning—a dark-colored rockweed—is directly derivable from the constituents. The compositional pattern is common cross-linguistically and follows normal English noun modification, so a B1 learner who knows both words would understand it.
Etymology
Black rockweed is a plain name: this seaweed is dark (black) and grows on rocks by the sea as a kind of rockweed. People collect it from the rocks to make 'kelp' and to spread as 'fertilizer', so the name shows what it is and how it is used.