The Collaborative International Dictionary of English v.0.48:

Bail bond \Bail" bond`\ (b[=a]l" b[o^]nd`). (Law)
      (a) A bond or obligation given by a prisoner and his
          surety, to insure the prisoner's appearance in court,
          at the return of the writ.
      (b) Special bail in court to abide the judgment.
          --Bouvier.
          [1913 Webster]

WordNet (r) 3.0 (2006):

bail bond
    n 1: (criminal law) money that must be forfeited by the bondsman
         if an accused person fails to appear in court for trial;
         "the judge set bail at $10,000"; "a $10,000 bond was
         furnished by an alderman" [syn: bail, bail bond,
         bond]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "bail bond":
   accident insurance, actuary, annuity, assurance,
   aviation insurance, bond, business life insurance,
   casualty insurance, certificate of insurance, court bond,
   credit insurance, credit life insurance, deductible,
   endowment insurance, family maintenance policy, fidelity bond,
   fidelity insurance, flood insurance, fraternal insurance,
   government insurance, health insurance, industrial life insurance,
   insurance, insurance agent, insurance broker, insurance company,
   insurance man, insurance policy, interinsurance,
   liability insurance, license bond, limited payment insurance,
   major medical insurance, malpractice insurance, marine insurance,
   mutual company, ocean marine insurance, permit bond, policy,
   robbery insurance, social security, stock company, term insurance,
   theft insurance, underwriter



Bouvier's Law Dictionary, Revised 6th Ed (1856):

BAIL BOND, practice, contracts. A specialty by which the defendant and other
persons, usually not less than two, though the sheriff may take only one,
become bound to the sheriff in a penalty equal to that for which bail is
demanded, conditioned for the due appearance of such defendant to the legal
process therein described, and by which the sheriff has been commanded to
arrest him. It is only where the defendant is arrested or in the custody of
the sheriff, under other than final process, that the sheriff can take such
bond. On this bond being tendered to him, which he is compelled to take if
the sureties are good, he must discharge the defendant. Stat. 23 H. VI. c.
9.
     2. With some exceptions, as for example, where the defendant
surrenders; 5 T. R. 754; 7 T. R. 123; 1 East, 387; 1 Bos. & Pull. 326;
nothing can be a performance of the condition of the bail bond, but putting
in bail to the action. 5 Burr. 2683.
     3. The plaintiff has a right to demand from the sheriff an assignment
of such bond, so that he may sue it for his own benefit. 4 Ann. c. 16, Sec.
20; Wats. on Sheriff, 99; 1 Sell. Pr. 126, 174. For the general requisites
of a bail bond, see 1 T. R. 422; 2 T. R. 569 15 East. 320; 2 Wils. 69; 6 T.
R. 702; 9 East, 55; . D. & R. 215; 4 M. & S. 338; 1 Moore, R. 514; 6 Moore,
R. 264 East, 568; Hurls. on Bonds, 56; U. S. Dig. Bail V.