crypt

Concise Oxford English Dictionary © 2008 Oxford University Press:
crypt/krɪpt/

▶noun

• 1 an underground room or vault beneath a church, used as a chapel or burial place.

• 2 Anatomy a small tubular gland, pit, or recess.

– origin ME (in the sense ‘cavern’): from L. crypta, from Gk kruptē ‘a vault’, from kruptos ‘hidden’.