A switch or a whip with a short lash, used by riders.(noun)
The Century Dictionary (Public Domain)
Use "riding-whip" in a sentence
"She lifted her riding-whip threateningly, and at the same moment drove in both spurs with her heels, rushing the startled horse straight at Gogoomy."
"Her riding-whip rose as if to strike him, then fell on the startled"
"But warmer still was the glow that came into his cheeks and burned in his eyes as he saw Dede coming out the door, riding-whip in hand, clad in the familiar corduroy skirt and leggings of the old Piedmont days."