seafloor

noun

sea·​floor ˈsē-ˌflȯr How to pronounce seafloor (audio)
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
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The rock was originally silt on the seafloor that, it's argued, hosted early microbial life that was buried by more silt, leaving the carbon as their remains. Howard Lee, ArsTechnica, 11 Aug. 2025 The Coast Guard also released footage during the hearing that showed Titan debris, including the tail cone, aft dome, aft ring, hull remnants and carbon fiber debris, on the seafloor. Meredith Deliso, ABC News, 5 Aug. 2025 On June 22, 2023, at approximately 9:40 a.m., the aft tail cone and other debris from the Titan were discovered on the seafloor after an extensive search. N'dea Yancey-Bragg, USA Today, 5 Aug. 2025 When a member of the group died, another member or a friend would carve the person’s name into a rock and free-dive to place the stone on the seafloor. Ashley MacKin Solomon, San Diego Union-Tribune, 31 July 2025 See All Example Sentences for seafloor

Word History

First Known Use

1853, in the meaning defined above

Time Traveler
The first known use of seafloor was in 1853

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Cite this Entry

“Seafloor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seafloor. Accessed 22 Aug. 2025.

Kids Definition

seafloor

noun
sea·​floor -ˌflō(ə)r How to pronounce seafloor (audio)
-ˌflȯ(ə)r
: seabed

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