Bible Dictionaries
Undercroft

Webster's Dictionary

(n.) A subterranean room of any kind; esp., one under a church (see Crypt), or one used as a chapel or for any sacred purpose.

Bibliography Information
Webster, Noah. Entry for 'Undercroft'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/undercroft.html. 1828.