Source : Webster's Revised Unabridged Dictionary (1913)

Jackass \Jack"ass`\, n. [2d jack + ass.]
   1. The male ass; a donkey.

   2. A conceited dolt; a perverse blockhead.

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

   {Jackass deer} (Zo["o]l.), the koba.

   {Jackass hare}, {Jackass rabbit} (Zo["o]l.). See {Jack
      rabbit}, under 2d {Jack}, n.

   {Jackass penguin} (Zo["o]l.), 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}. (Zo["o]l.) See under {Laughing}.



   {Laughing goose} (Zo["o]l.), the European white-fronted
      goose.

   {Laughing gull}. (Zo["o]l.)
   (a) A common European gull ({Xema ridibundus}); -- called
       also {pewit}, {black cap}, {red-legged gull}, and {sea
       crow}.
   (b) An American gull ({Larus atricilla}). In summer the head
       is nearly black, the back slate color, and the five outer
       primaries black.

   {Laughing hyena} (Zo["o]l.), the spotted hyena. See {Hyena}.
      

   {Laughing jackass} (Zo["o]l.), the great brown kingfisher
      ({Dacelo gigas}), of Australia; -- called also {giant
      kingfisher}, and {gogobera}.

   {Laughing owl} (Zo["o]l.), a peculiar owl ({Sceloglaux
      albifacies}) of New Zealand, said to be on the verge of
      extinction. The name alludes to its notes.

Source : WordNet®

laughing jackass
     n 1: Australian kingfisher having a loud cackling cry [syn: {kookaburra},
           {Dacelo gigas}]
     2: almost extinct owl of New Zealand [syn: {laughing owl}, {Sceloglaux
        albifacies}]