subbasement

English

Etymology

sub- +‎ basement

Noun

subbasement (plural subbasements)

1. A basement located beneath another basement
   • 2007 February 8, David W. Dunlap, “What May Have Made Good Neighbors Now Present a Puzzle”, New York Times:

     Joan H. Geismar is trying to unravel the mystery of old stone walls in the subbasement of Federal Hall National Memorial on Wall Street.