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

Comparisons of seafloor topography before and after the eruption showed that a roughly 4-kilometer-wide caldera sank by about a kilometer during the eruption. — Yook Ji Hun, ArsTechnica, 23 Sep. 2026

Photographic evidence In photos and videos captured by the divers and seen by CNN, the plane appears embedded in the seafloor, rusted and covered in barnacles, as could be expected after decades under water. — Brad Lendon, CNN Money, 18 Sep. 2026

Underwater robots are widely used to explore water bodies, map the seafloor, monitor coral reefs, measure water quality, and study aquatic animals. — Maryna Holovnova, New Atlas, 8 Sep. 2026

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

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