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