Etymology
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sumpter (n.)

c. 1300, "driver of a pack horse," from Old French sommetier "pack-horse driver," from Vulgar Latin *sagmatarius "a pack horse driver," from Late Latin sagmat- "a pack, burden," stem of sagma "packsaddle," from Greek sagma, probably related to sattein "to pack, press, stuff." Used from mid-15c. of horses and mules for carrying loads.

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Definitions of sumpter

sumpter (n.)
an animal (such as a mule or burro or horse) used to carry loads;
Synonyms: pack animal
From wordnet.princeton.edu