Extended Strong's Greek Lexicon (Abbott-Smith based)
fellow slave
Usage: σύν-δουλος, -ου, ὁ [in LXX: Est.4:7, 9 4:17, 23 5:3, 6 6:6, 13 (כְּנָת) * ;] a fellow-servant: Mat.18:28-33 24:49; of servants of the same divine Lord, Col.1:7 4:7, Rev.6:11; so of angels, Rev.19:10 22:9.† (AS)