seafloor

American  

[see-flawr] / ˈsiˌflɔr /

Or sea floor

noun

1. the solid surface underlying a sea or an ocean.

---

Etymology

Origin of seafloor

First recorded in 1850–55; sea + floor

Example Sentences

Though the platforms will float, they still must be tethered to the seafloor.

From Los Angeles Times • Apr. 9, 2026

Later, a criminal complaint against Thompson said the gold bars and coins he recovered from the seafloor were worth up to $400m.

From BBC • Mar. 14, 2026

Kingfish and Lionfish drones External link, made by Huntington Ingalls, can scan the seafloor for mines.

From Barron's • Mar. 11, 2026

At about 180 million years old, they formed during a time when animals were actively disturbing the seafloor worldwide, which normally erases delicate microbial textures.

From Science Daily • Mar. 8, 2026

It was equally dismissive of convection and seafloor spreading.

From "A Short History of Nearly Everything" by Bill Bryson