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subbasement

[suhb-beys-muh nt]
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noun
  1. a basement or one of a series of basements below the main basement of a building.
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Origin of subbasement

First recorded in 1900–05; sub- + basement
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for subbasement

subbasement

noun
  1. an underground storey of a building beneath the main basement
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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