sumpter

n.
A pack animal, such as a horse or mule.

[Middle English, driver of a packhorse, from Old French sometier, from Vulgar Latin *saumatārius, from Late Latin sagma, sagmat-, packsaddle, from Greek, from sattein, to pack.]

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The noun has one meaning:

Meaning #1: an animal such as a mule or burro or horse used to carry loads
  Synonym: pack animal

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