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seamount

[see-mount] /ˈsiˌmaʊnt/
noun
1.
a submarine mountain rising several hundred fathoms above the floor of the sea but having its summit well below the surface of the water.
Origin of seamount
1945-1950
First recorded in 1945-50; sea + mount2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for seamount

seamount

/ˈsiːˌmaʊnt/
noun
1.
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
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Word Origin and History for seamount
n.

by 1908, from sea + mount (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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seamount in Science
seamount
  (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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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