Jack"ass` (?), n. [2d jack + ass.]
The male ass; a donkey.
A conceited dolt; a perverse blockhead.
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 2d 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 braying of an ass; -- hence the name. -- Laughing jackass. Zool. See under Laughing.
© Webster 1913.