seabottom
nounUK /ˈsiːˌbɒtəm/
US /ˈsiːˌbɑːtəm/
The seabottom is the ground at the very bottom of the sea.
Crabs and starfish crawl along the seabottom.
OTHER MEANINGS
2. The lowest part of a body of water where sediment collects.
Mud settled on the seabottom near the river mouth.
3. A place deep underwater where sunlight rarely reaches.
Strange fish live on the dark seabottom.
4. The base layer of the ocean that supports sea plants and animals.
Kelp grows from the rocky seabottom.