vault

Concise Oxford English Dictionary © 2008 Oxford University Press:
vault1 /vɔːlt/

▶noun

• 1 a roof in the form of an arch or a series of arches, typical of churches and other large, formal buildings.

• 2 a large room or chamber used for storage, especially an underground one.

  ■ a secure room in a bank in which valuables are stored.

  ■ a chamber beneath a church or in a graveyard used for burials.

• 3 Anatomy the arched roof of a cavity, especially that of the skull.

▶verb (usu. as adj. vaulted) provide with or form into an arched roof.

– origin ME: from OFr. voute, based on L. volvere ‘to roll’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
vault2 /vɔːlt/

▶verb leap or spring while supporting or propelling oneself with the hands or a pole. ▶noun an act of vaulting.

– derivatives
vaulter noun.

– origin C16: from OFr. volter ‘to turn a horse, gambol’.