furdown

a ceiling or part of a ceiling that is lower than the primary ceiling structure. A furdown is often constructed to enclose ducts or pipe that cannot be installed in the ceiling framing spaces and must be installed below the standard ceiling level. The rectangular finished structure above kitchen cabinets is often referred to as a furdown. Also called "Furred Ceiling", "Furred Down Ceiling" and "Drop Ceiling". See also Soffit.

Alternate spellings and misspellings: furrdown, fur-down, furr-down, furr down