Dictionary entry

σύνδουλος

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

σύν-δουλος, -ου, ὁ

[in LXX: Es 4:7, 9, 17, 23 5:3, 6 6:6, 13 (כְּנָת) *;]

a fellow-servant: Mt 18:28-33 24:49; of servants of the same divine Lord, Col 1:7 4:7, Re 6:11; so of angels, Re 19:10 22:9.†