noun Geology.
a part of the continental crust above sea level having a distinct identity, as a continent or large island.

1855–60; land + mass Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
landmass (ˈlændˌmæs)
a large continuous area of land, as opposed to seas or islands

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
landmass   (lānd'mās')  Pronunciation Key 
A large, continuous area of land, such as a continent or a very large island.
The American Heritage® Science Dictionary
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