Sump″ter (?), n. [OF. sommetier the driver of a pack horse; akin to OF. & F. sommier a pack horse, L. sagmarius, fr. sagma a pack saddle, in LL., a load, Gr. � a pack saddle, fr. � to pack, load; cf. Skr. saj, sañj, to hang on. Cf. Seam a weight, Summer a beam.] 1. The driver of a pack horse. Skeat.
2. A pack; a burden. Beau. & Fl.
3. An animal, especially a horse, that carries packs or burdens; a baggage horse. Holinshed.