What is the meaning of Crypt?

A cave or cavern.

An underground vault.

2. Especially: one beneath a church that is used as a burial chamber.

   Especially: one beneath a church that is used as a burial chamber.

   A small pit or cavity in the surface of an organ or other structure.

   Any of the genus Cryptocoryne of aquatic plants of southern and southeastern Asia.

   Any of the genus Cryptopus of orchids of Madagascar and Mauritius.

   Source: wiktionary.org