'Guarantor' definitions:

Definition of 'guarantor'

(from WordNet)
noun
One who provides a warrant or guarantee to another [syn: guarantor, surety, warrantor, warranter]

Definition of 'Guarantor'

From: GCIDE
  • Guarantor \Guar"an*tor`\, n. [See Guaranty, and cf. Warrantor.] (Law) (a) One who makes or gives a guaranty; a warrantor; a surety. (b) One who engages to secure another in any right or possession. [1913 Webster]

Synonyms of 'guarantor'

From: Moby Thesaurus