Definition of sumpter in English:

sumpter

noun

archaic
  • A pack animal.

    as modifier ‘a sumpter mule’
    • ‘Geldings, coach horses, close carr horses, litter horses and sumpter horses sent expressly for the use of the royal party were allowed 2s per day.’
    • ‘They comprised geldings and nags, sumpter horses, teams for coaches, the litter and three carts, as well as some hired post horses.’
    • ‘A team of sumpter horses (pack horses), each one in the care of its own sumpterrnan, riding his own horse, was sent up to carry the queen's baggage.’

Origin

Middle English: from Old French sommetier, via late Latin from Greek sagma, sagmat- ‘packsaddle’; compare with summer.

Pronunciation

sumpter

/ˈsʌm(p)tə/