a cave, especially one that is large and mostly underground.
Pathology. a cavity that is produced by disease, especially one produced in the lungs by tuberculosis.
verb (used with object)
to enclose in or as if in a cavern.
to hollow out to form a cavern.

1325–75; Middle English caverne < Latin caverna, equivalent to cav(us) hollow + -erna, as in cisterna cistern Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cavern (ˈkævən)
1.  a cave, esp when large and formed by underground water, or a large chamber in a cave
2.  to shut in or as if in a cavern
3.  to hollow out
[C14: from Old French caverne, from Latin caverna, from cavus hollow; see cave1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. caverne, from L.L. caverna "cave," from L. cavus (see cave).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cavern   (kāv'ərn)  Pronunciation Key 
A large cave.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
My bad, the former thread has moved back in its cavern my apologies.
Only a small portion of the cavern has been explored so far.
During off-peak times, electricity runs a compressor which pumps the air down
  into the cavern.
Excavation revealed a giant limestone cavern beneath the fortress.
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