ass

Multiple Entries:
  ass    -ass  

Concise Oxford English Dictionary © 2008 Oxford University Press:
ass1 /as/

▶noun

• 1 an animal of the horse family which is smaller than a horse and has longer ears and a braying call. [Equus africanus (Africa) and E. hemionus (Asia).]

  ■ (in general use) a donkey.

• 2 informal a foolish or stupid person.

– origin OE assa, from a Celtic word rel. to Welsh asyn, Breton azen, based on L. asinus.

Concise Oxford English Dictionary © 2008 Oxford University Press:
ass2 /ɑːs, as/

▶noun N. Amer. vulgar slang a person's buttocks or anus.

– origin var. of arse.

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ass /ɑs/

▶combining form N. Amer. informal used in derogatory terms as an intensifier: smart-ass.