See the full definition for seafloor in the english language learners dictionary.
What is a sea floor.
The ground that is at the bottom of the sea.
The ocean floor is literally the floor of the ocean.
It is the bottom of the ocean when you dive.
The outer rocky layer of the earth includes about a dozen large sections called tectonic plates that are arranged like a spherical jig saw puzzle floating on top of the earth s hot flowing mantle.
Not too many people have gone to the floor of the ocean as it requires special diving equipment.