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

Nearly two miles underwater, southwest of Walker Seamount, in an unnamed volcanic feature, researchers spotted a golden orb about four inches in diameter, smooth and shiny, with a hole in the middle, attached to a rock on the seafloor. — Encyclopedia Britannica, 25 Aug. 2026

The same technology could be applied to mining rare-earth minerals from the seafloor—materials used in wind turbines, solar farms, and electric vehicles. — Brett Berk, Robb Report, 22 Aug. 2026

Part of that effort included setting up a waterproof data center on the seafloor near Scotland’s Orkney Islands in 2018. — Nir Kshetri, The Conversation, 17 Aug. 2026

Fossil collectors report finding the teeth in coastal rivers or along seafloor ledges that have been scoured by storms and currents. — Mark Price, Charlotte Observer, 16 Aug. 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