Undercroft
Pronunciation : Un"der*croft
Part of Speech : n.
Etymology : [Under + Prov. E. croft a vault; cf. OD. krochte crypt, and E. crypt.] (Arch.)
Definition : Defn: A subterranean room of any kind; esp., one under a church (see Crypt), or one used as a chapel or for any sacred purpose.
Source : Webster's Unabridged Dictionary, 1913