variants
or less commonly sea floor
plural seafloors also sea floors
: the floor of a sea or ocean : seabed
The Earth's crust, in this view, is divided into several immense plates that make up the continents and seafloors, and that all float on a hot, plastic, subterranean "mantle."—
Walter Sullivan
Walter SullivanExamples of seafloor in a Sentence
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Below the dark, jagged water in front of us, the seafloor plummeted to nearly 1,000 feet—the deepest channel in the San Juan Islands.
—Kelso Harper, Scientific American, 16 Dec. 2025
Heavy grazing strips plant life from the seafloor, creating barren underwater landscapes.
—Aamir Khollam, Interesting Engineering, 12 Dec. 2025
Non-calcareous algae expanded as water became more acidic, with brown and red algae spread across the seafloor, enjoying the space and reduced competition.
—New Atlas, 29 Nov. 2025
The Doheny plant would be the first commercial-scale desalination project to use slant wells designed to collect ocean water from beneath the seafloor and pull it through sand, which eliminates risks to most sea life.
—Laylan Connelly, Oc Register, 26 Nov. 2025
See All Example Sentences for seafloor
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Kelso Harper, Scientific American, 16 Dec. 2025
Heavy grazing strips plant life from the seafloor, creating barren underwater landscapes.
—Aamir Khollam, Interesting Engineering, 12 Dec. 2025
Non-calcareous algae expanded as water became more acidic, with brown and red algae spread across the seafloor, enjoying the space and reduced competition.
—New Atlas, 29 Nov. 2025
The Doheny plant would be the first commercial-scale desalination project to use slant wells designed to collect ocean water from beneath the seafloor and pull it through sand, which eliminates risks to most sea life.
—Laylan Connelly, Oc Register, 26 Nov. 2025
See All Example Sentences for seafloor
Cite this Entry
“Seafloor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seafloor. Accessed 19 Dec. 2025.
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