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An underground passageway, chamber, or series of chambers, sometimes having a roof of stone slabs, built as part of an ancient settlement or fort, especially in the British Isles.
[Earlier, any underground passage or storeroom, from French, from Old French, sozterrain (formed on the model of Latin subterrāneus, underground) : soz, under (from Latin subtus, from sub; see upo in Indo-European roots) + terre, earth (from Latin terra; see ters- in Indo-European roots).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Archaeology) archaeol an underground chamber or passage
[C18: from French]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Any underground passage or chamber.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited