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From The Collaborative International Dictionary of English v.0.48:
Guaranty \Guar"an*ty\, n.; pl. Guaranies. [OF. guarantie, garantie, F. garantie, OF. guarantir, garantir, to warrant, to guaranty, E. garantir, fr. OF. guarant, garant, a warranter, F. garant; of German origin, and from the same word as warranty. See Warrant, and cf. Warranty, Guarantee.] In law and common usage: An undertaking to answer for the payment of some debt, or the performance of some contract or duty, of another, in case of the failure of such other to pay or perform; a guarantee; a warranty; a security. [1913 Webster]