The crypt of a church; an underground vault or chamber.

An enclosed space covered with an arched roof; esp. a lower or underground apartment or portion of a building constructed in this form.

A room below ground level in a house or other building, typically used for storage.

With the epithet mountain: An umbelliferous plant of the genus Seseli.

A cavern, a crypt; (also) a covered or subterranean passage.

= hypogeum, n.

An underground chamber or vault.

An underground chamber, store-room, passage, etc.

(See quot.)

(under-, prefix1 affix 2b(c).)

In Western Asia, a cellar or underground chamber.

a basement sunk only part of its depth below the ground surface.

A cellar or underground passage, esp. in a tenement building.