seafloor

noun

sea·​floor ˈsē-ˌflȯr 

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

Examples of seafloor in a Sentence

Recent Examples on the Web

Kilometers below the ocean’s surface, Earth’s seafloors are on the move. — Sam MacDonald, Scientific American, 8 July 2026

Latter visits from the French supply ships performed three-dimensional mapping of the seafloor in the area to determine the outcome of any events that were detected. — John Timmer, ArsTechnica, 8 July 2026

The biggest hurdle to mapping the shallow seafloor is the water itself. — Mrigakshi Dixit, Interesting Engineering, 3 July 2026

As astronauts circled the Earth, aquanauts moved into seafloor labs. — Bill Gourgey, Popular Science, 2 July 2026

Word History

First Known Use

1853, in the meaning defined above

Phrases Containing seafloor

• seafloor spreading

Rhymes for seafloor

• abhor
• abor
• adore
• afore
• ardour
• ashore
• backdoor
• before
• bookstore
• candour
• centaur
• claymore

Kids Definition

seafloor

noun

sea·​floor -ˌflō(ə)r 

-ˌflȯ(ə)r

: seabed