GNU Collaborative International Dictionary of English

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1.       
   Jackass , n. [2d jack + ass.]
   1913 Webster
   The male ass; a donkey.
   1913 Webster
   A conceited dolt; a perverse blockhead; -- disparaging and offensive.
   1913 Webster
   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 (Spheniscus demersus) inhabits the islands near the Cape of Good Hope; another (Spheniscus 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.
   1913 Webster