seamount

[see-mount]
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.

Origin:
1945–50; sea + mount2

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Collins
World English Dictionary
seamount (ˈsiːˌmaʊnt)
 
n
Compare guyot a submarine mountain rising more than 1000 metres above the surrounding ocean floor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
seamount   (sē'mount')  Pronunciation Key 
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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Example sentences
It can also indicate a seamount, or underwater mountain.
We dropped down to this deep seamount, and the current was ripping.
We grabbed on to the seamount, and this big shoal of hammerheads came by.
Seamount is an underwater mountain formed by volcanic activity.
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