Ass

as, n. a well-known quadruped of the horse family: ( fig. ) a dull, stupid fellow.— A es' bridge , or Pons asinorum , a humorous name for the fifth proposition of the first book of Euclid. [A.S. a a , the earlier Teutonic form being esol , esil (Goth. asilus )—L. asinus ; Gr. onos , a . Perh. ult. of Semitic origin, as in Heb. āthōn , a she-a .]