ἔγγυος (éngyos|eng'-goo-os|adjective|security)
[Grk] ἔγγυος LN: 70.8 GK: G1583
Derivation: from ἐν and γυῖον (a limb);
Strong's: pledged (as if articulated by a member), i.e. a bondsman
KJV: --surety.
See: ἐν