D defs.my
Entry 2 senses Webster, 1913

Ass

/ăs/ · IPA /æs/
01 n. A quadruped of the genus Equus (Equus asinus), smaller than the horse, and having a peculiarly harsh bray and long ears. The tame or domes…
  1. 1.
    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.(Zool.)
  2. 2.
    A dull, heavy, stupid fellow; a dolt.
Phrases & compounds
Asses' Bridge — The fifth proposition of the first book of Euclid, “The angles at the base of an isosceles triangle are equal to one another.”
To make an ass of one's self — to do or say something very foolish or absurd.