Source : Webster's Revised Unabridged Dictionary (1913)

Garran \Gar"ran\, n. [Gael. garr['a]n, gearr['a]n, gelding, work
   horse, hack.] (Zo["o]l.)
   See {Galloway}. [Scot. {garron} or {gerron}. --Jamieson.]