galloper

gallop +‎ -er

galloper (plural gallopers)

1. One who gallops.
   • Rudyard Kipling, The Drums of the Fore and Aft

     The lancers chafing in the right gorge had thrice dispatched their only subaltern as galloper to report on the progress of affairs.

2. A racehorse.
   • 2009, January 25, “Rod Nicholson”, in Get ready for Hussler v Cat‎:

     The Hussler's trainer, Ross McDonald, is confident Australia's champion galloper will win the clashes, despite Weekend Hussler never having competed over 1000m before.

3. A carousel or roundabout (especially in the plural)
4. (military) A carriage on which very small guns were formerly mounted, the gun resting on the shafts, without a limber.

   (Can we find and add a quotation of Farrow to this entry?)