Merriam-Webster's Collegiate® Dictionary, 11th Edition
GALLOP
I. verb
Date: 15th century
intransitive verb to progress or ride at a gallop, to run fast, transitive verb to cause to gallop, to transport at a gallop, galloper noun
II. noun
Etymology: Middle French galop
Date: 1523
a bounding gait of a quadruped, a ride or run at a gallop, a stretch of land suitable for galloping horses, a rapid or hasty progression or pace