Strong's Concordance

Original word: σύνδεσμος
Transliteration: sundesmos
Definition (short): bond
Definition (full): that which binds together, a bond

NAS Exhaustive Concordance

Word Origin: from sundeó
Definition: that which binds together, i.e. a bond
NASB Translation: bond (1), bond of unity (1), bondage (1), ligaments (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From sun and desmon; a joint tie, i.e. Ligament, (figuratively) uniting principle, control -- band, bond.

see GREEK sun

see GREEK desmon

KJV: For I perceive that thou art in the gall of bitterness, and in the bond of iniquity.
NASB: "For I see that you are in the gall of bitterness and in the bondage of iniquity."
KJV: Endeavouring to keep the unity of the Spirit in the bond of peace.
NASB: being diligent to preserve the unity of the Spirit in the bond of peace.
KJV: And not holding the Head, from which all the body by joints and bands having nourishment ministered, and knit together, increaseth with the increase of God.
NASB: and not holding fast to the head, from whom the entire body, being supplied and held together by the joints and ligaments, grows with a growth which is from God.
KJV: And above all these things put on charity, which is the bond of perfectness.
NASB: Beyond all these things put on love, which is the perfect bond of unity.