[sump.ter] n [ME, short for sumpter horse, fr. sumpter driver of a packhorse, fr. MF sometier, fr. (assumed) VL sagmatarius, fr. LL sagmat-, sagma packsaddle, fr. Gk; akin to Gk sattein to pack, stuff] (15c): a pack animal
SUMPTER
Meaning of SUMPTER in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012