sub·​base·​ment ˌsəb-ˈbās-mənt How to pronounce subbasement (audio)
variants or sub-basement
plural subbasements or sub-basements
: a basement or an underground story located below the main basement of a building
… describing in loving detail the enormous, complex structure from the bottom up, its subbasement … is full of gleaming pipes, turbines and boilers.Burton Bernstein

Word History

First Known Use

circa 1776, in the meaning defined above

Time Traveler
The first known use of subbasement was circa 1776

Dictionary Entries Near subbasement

Cite this Entry

“Subbasement.” Dictionary, Merriam-Webster, Accessed 4 Feb. 2023.

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