σειρᾱφόρος · seiraphoros — LSJ
which draws by the trace only, trace-horse, yoke-mate, coadjutor, one who has light work, attached like a trace-horse
which draws by the trace only (being harnessed by the side of the pair under the yoke, οἱ ζύγιοι), trace-horse: hence metaph., sts. yoke-mate, coadjutor, A. Ag. 842; sts. one who has light work, ib. 1640, cf. Ar. Nu. 1300; σ. [κάμηλος] attached like a trace-horse, Hdt. 3.102.
II carrying a lasso
carrying a lasso, v. σειρά I.3.