# seafloor

/sˈiːflɔː/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/seafloor
Updated: 2026-10-15

## Definition

the ground at the bottom of the sea or ocean. You use it when you talk about the sand, rocks, and plants under the water.

For teachers: the solid surface forming the bottom of a sea or ocean, composed of sediment, rock, and other deposits.

## Examples

- Crabs and starfish live on the seafloor.
- The divers swim down to study the shells and rocks on the seafloor.
- Geologists map the seafloor to track underwater mountains, deep valleys, and zones where tectonic plates slowly pull apart.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.