subbasement

noun
sub·base·ment | \ ˌsəb-ˈbās-mənt \
variants: or sub-basement
plural subbasements or sub-basements

Definition of subbasement 

: 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

First Known Use of subbasement

circa 1776, in the meaning defined above

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Dictionary Entries near subbasement

subaxillary

subbasal

subbase

subbasement

subbasin

sub-bass

subbifid

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The first known use of subbasement was circa 1776

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