seaplant
nounUK /ˈsiːplɑːnt/
US /ˈsiːplænt/
A seaplant is a plant that lives in the ocean.
We saw a bright green seaplant growing on the rocks at the beach.
OTHER MEANINGS
2. Any plant-like organism that grows in salt water, such as kelp or seagrass.
The seaplant swayed gently with the waves.
3. A plant used in aquariums to decorate or feed fish.
He added a plastic seaplant to his fish tank.
4. A plant harvested from the sea for food or fertilizer.
Farmers use dried seaplant to help their crops grow.