'lockbox' definitions:

Definition of 'lockbox'

(from WordNet)
noun
A fireproof metal strongbox (usually in a bank) for storing valuables [syn: safe-deposit, safe-deposit box, safety-deposit, safety deposit box, deposit box, lockbox]

Definition of 'lockbox'

From: GCIDE
  • lockbox \lock"box`\, n. A box of strong and durable construction, fitted with a lock, used for the purpose of protecting valuable items, such as money or jewelry; a strongbox. [PJC]