from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A crypt, especially one used for burial under a church.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A cellar or vaulted storage room.
from the GNU version of the Collaborative International Dictionary of English
- 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.
from The Century Dictionary and Cyclopedia
- n. Any vault or secret passage under ground.
Middle English : under-, under- + croft, crypt (from Middle Dutch crofte, from Medieval Latin crupta, from Latin crypta, crypt; see crypt).(American Heritage® Dictionary of the English Language, Fourth Edition)
under + croft (Wiktionary)