abyssal hill

noun

Definition of abyssal hill 

: any of the numerous relatively low elevations arising from the ocean floor Low abyssal hills (less than 1 kilometer above the surrounding ocean bottom) cover about 80% of the Pacific floor and about half of the Atlantic. —M. Grant Gross, Oceanography 5th Edition, 1990 — compare abyssal plain, seamount

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First Known Use of abyssal hill

1960, in the meaning defined above

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