Yokefellow - Vine's Expository Dictionary of New Testament Words
Yokefellow
[ 1,,G4805,sunzugos / suzugos ] an adjective denoting yoked together," is used as a noun in Philippians 4:3, "a yokefellow, fellow laborer;" probably here it is a proper name, Synzygus, addressed as "true," or "genuine" (gnesios), i.e., "properly so-called."