subbasement

noun sub·base·ment \ ˌsəb-ˈbās-mənt \
variants: or sub-basement

Definition of subbasement

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

First Known Use of subbasement

circa 1776

in the meaning defined above

See Words from the same year
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