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seamount

American

[see-mount] / ˈsiˌmaʊnt /

noun

a submarine mountain rising several hundred fathoms above the floor of the sea but having its summit well below the surface of the water.

seamount British

/ ˈsiːˌmaʊnt /

noun

a submarine mountain rising more than 1000 metres above the surrounding ocean floor Compare guyot

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

seamount Scientific

/ sē′mount′ /

A large underwater mountain, usually conical in shape and at least 1,000 m (3,280 ft) above the ocean floor. Seamounts are usually isolated and are volcanic in origin.

Etymology

Origin of seamount

First recorded in 1945–50; sea + mount ²

Vocabulary lists containing seamount

Earth Science - Middle School

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Earth Science - High School

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Earth Science - Introductory

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The ship's latest mission focuses on a seamount chain off Indonesia's Sulawesi island that scientists on board mapped last year.

From Barron's • Jan. 26, 2026

Thousands of deep-sea octopuses gather on the flanks of a seamount off California’s coast.

From Scientific American • Aug. 23, 2023

The Connecticut, one of three advanced Seawolf submarines, hit the uncharted seamount on Oct.

From Seattle Times • Jun. 15, 2023

Published this month in Earth and Space Science, the new seamount catalog is “a great step forward,” says Larry Mayer, director of the University of New Hampshire’s Center for Coastal and Ocean Mapping.

From Science Magazine • Apr. 18, 2023

The discovery was notable for a couple of reasons, Elmore explained — the seamount was found in an area where the features are uncommon, and it has an unusual shape.

From Los Angeles Times • Mar. 31, 2023

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023