J

n. The male ass; a donkey. A conceited dolt; a perverse blockhead. A stupid or silly person.

 - Jackass bark (Naut.), a three-masted vessel, with only the foremast square-rigged; a barkentine.

 - Jackass deer (Zool.), the koba.

 - Jackass hare, Jackass rabbit (Zool.). See Jack rabbit, under Jack, n.

 - Jackass penguin (Zool.), any species of penguin of the genus Spheniscus, of which several are known. One species (S. demersus) inhabits the islands near the Cape of Good Hope; another (S. Magellanicus) is found at the Falkland Islands. They make a noise like the ...