Ass n.
 1. Zool. A quadruped of the genus Equus (Equus asinus), smaller than the horse, and having a peculiarly harsh bray and long ears.  The tame or domestic ass is patient, slow, and sure-footed, and has become the type of obstinacy and stupidity.  There are several species of wild asses which are swift-footed.
 2. A dull, heavy, stupid fellow; a dolt.
 Asses' Bridge. [L. pons asinorum.] The fifth proposition of the first book of Euclid, “The angles at the base of an isosceles triangle are equal to one another.” [Sportive] “A schoolboy, stammering out his Asses' Bridge.” --F. Harrison.
 To make an ass of one's self, to do or say something very foolish or absurd.
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 Equus asinus
      n 1: a wild ass of Africa [syn: African wild ass]
      2: domestic beast of burden descended from the African wild
         ass; patient but stubborn [syn: domestic ass, donkey]