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

The ambient temperature of water around the seamount is about 35 degrees Fahrenheit, according to Monterey Bay Aquarium Research Institute scientists.

From Los Angeles Times • Aug. 30, 2023

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

But radar satellites that measure ocean height can also find them, by looking for subtle signs of seawater mounding above a hidden seamount, tugged by its gravity.

From Science Magazine • Apr. 18, 2023

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