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

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The first known use of subbasement was circa 1776

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