debenture
A certificate or voucher acknowledging a debt.
An unsecured bond issued by a civil or governmental corporation or agency and backed only by the credit standing of the issuer.
A customhouse certificate providing for the payment of a drawback.
mameluke
A member of a former military caste, originally composed of slaves from Turkey, that held the Egyptian throne from about 1250 until 1517 and remained powerful until 1811.