Strong's #1450: egguos (pronounced eng'-goo-os)
from 1722 and guion (a limb); pledged (as if articulated by a member), i.e. a bondsman:--surety.
Thayer's Greek Lexicon:
̓́
egguos
1) a surety, a sponsor
Part of Speech: adjective
Relation: from G1722 and guion (a limb)
Citing in TDNT: 2:329, 194
Usage:
This word is used 1 times:
Hebrews 7:22: "so much was Jesus made a surety of a better testament."