Wiktionary
subfloors
n. (plural of subfloor English)
Usage examples of "subfloors".
We suspected that a Nest lay under the tower itself, under the subfloors of the old vaults, though we could find no sign of it.
Now that the assault was on, they moved faster through the subfloors, following the location signal.
Somehow she had made her way down two secure subfloors of a major government building to attempt to assassinate the chief of staff.