variants:
or less commonly sea floor
plural seafloors also sea floors
Definition of seafloor
: 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
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Merriam-Webster unabridged
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Time Traveler for seafloor
The first known use of seafloor was in 1853
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