See the entire entry for syṭwm n.m. seal

TgEsth¹08:10 :רהטונין רהטי סוסואן ורכבי רכשא ערטוליני רמכין דאיתנטלו טחוליהון ואיקדרו/ואיקדדו/ פיסת כף רגליהון : runners who run horses and ride bare-backed military mules, whose spleens had been removed and the soles of whose feet had been made calloused (var. penetrated) [See BT San 21b]

See the entire entry for ˁrṭwlyn adj. bare back (horses)