One who makes or gives a guaranty; a warrantor; a surety.
(b)
One who engages to secure another in any right or possession.
Webster 1828 Edition
Guarantor
GUAR'ANTOR
,
Noun.
gar'antor. A warrantor; one who engages to see that the stipulations of another are performed; also,one who engages to secure another in any right or possession.