Definition of jackrabbit in US English:

jackrabbit

noun

  • A hare found in open country in western North America.

    Genus Lepus, family Leporidae: several species, including the blacktail jackrabbit (L. californicus)

    • ‘The hawks hunt cooperatively with several birds simultaneously swooping on their prey, which consists of woodrats, jackrabbits, and other birds.’
    • ‘Some jackrabbits have been clocked at 70 km/hr, an astonishing speed for a small animal.’
    • ‘Varmints, those troublesome, unpleasant or despicable animals, include coyotes, fox, raccoons, ground hogs, ground squirrels, prairie dogs, jackrabbits and other small rodents.’
    • ‘For years we were overrun with jackrabbits to the point their hunting and netting was featured in Life magazine, but they run in cycles and are now in the down cycle with very few encountered.’
    • ‘The huge ears of jackrabbits enable them to regulate their body heat by increasing or decreasing the blood flow through their ears which helps them to absorb heat or cool off when temperatures in their environment change.’

Origin

Mid 19th century: abbreviation of jackass-rabbit, because of its long ears.

Pronunciation

jackrabbit

/ˈdʒækˌræbət//ˈjakˌrabət/