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

Sharks are known to rub against reefs, sand, rocks and even the seafloor to remove irritants. — Melissa Cristina Márquez, Forbes.com, 28 July 2026

The region — including the abyssal plain and deep seafloor — are among the least studied in the world. — Velvet Wu july 26, Sacbee.com, 26 July 2026

Zinzindohoué says future expeditions—including direct coral sampling and broader seafloor surveys of the west African coast—will be needed to determine the reef's full extent and to reconstruct its history. — Sanidhya Sharma, Scientific American, 22 July 2026

The crabs also burrow in the muddy seafloor to hide from predators and better withstand winter temperatures. — Kasha Patel, CNN Money, 18 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