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From The Collaborative International Dictionary of English v.0.48:
Jackass \Jack"ass`\, n. [2d jack + ass.] [1913 Webster] 1. The male ass; a donkey. [1913 Webster] 2. 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]