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"seafloor" is also used as a crossword clue. If that's what you saw, the answer is often benthic (7 letters).
Definitions
The bottom surface of a sea or ocean.
Word origin
From sea + floor.
Used in a sentence
“The seafloor is often covered with sediment.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Ocean bottom”8 letters
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