Bottom surface of a room (5)
I believe the answer is:
floor
(Other definitions for floor that I've seen before include "Part of building" , "Bottom surface" , "Minimum (price) level" , "Minimum level or sea bottom" , "Fox" .)
I believe the answer is:
floor
(Other definitions for floor that I've seen before include "Part of building" , "Bottom surface" , "Minimum (price) level" , "Minimum level or sea bottom" , "Fox" .)