A zebroid; spec. the offspring of a male zebra and female horse.
1841
Equine mules..may be justly regarded as unable to continue their race: the Paris zebra mule likewise evinced an indifference, which..proved a similar state of organic inability.
C. H. Smith, Natural History of Horses (Naturalist's Libr.: Mammalia XII) 343
1926
‘Zebra mules’ found hardy stock for harness work.
China Press (Shanghai) 16 June 4/1 (headline)
2016
A cross between the male zebra and female horse is called a zorse, or zebra mule.