From sun and doulos; a co-slave, i.e. Servitor or ministrant of the same master (human or divine) -- fellowservant.
see GREEK sun
see GREEK doulos
a. the associate of a servant (or slave) in the proper sense: Matthew 24:49.
b. one who with others serves (ministers to) a king: Matthew 18:28, 29, 31, 33.
c. the colleague of one who is Christ's servant in publishing the gospel: Colossians 1:7; Colossians 4:7 ((where cf. Lightfoot)).
d. one who with others acknowledges the same Lord, Jesus, and obeys his commands: Revelation 6:11.
e. one who with others is subject to the same divine authority in the Messianic economy: so of angels as the fellow-servants of Christians, Revelation 19:10; Revelation 22:9. (Moeris says, p. 273, ὁμόδουλος ἀττικως, σύνδουλος ἑλληνικως. But the word is used by Aristophanes, Euripides, Lysias.)