undercroft

[ uhn-der-krawft, -kroft ]
/ ˈʌn dərˌkrɔft, -ˌkrɒft /

noun

a vault or chamber under the ground, especially in a church.

Origin of undercroft

Middle English word dating back to 1350–1400; see origin at under, croft1
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British Dictionary definitions for undercroft

undercroft

/ (ˈʌndəˌkrɒft) /

noun

an underground chamber, such as a church crypt, often with a vaulted ceiling

Word Origin for undercroft

C14: from croft a vault, cavern, from earlier crofte, ultimately from Latin crypta crypt
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012