Source : Webster's Revised Unabridged Dictionary (1913)

Moron \Mo*ron"\, n.; Sp. pl. {Morones}. [Sp.]
   An inferior olive size having a woody pulp and a large
   clingstone pit, growing in the mountainous and high-valley
   districts around the city of Moron, in Spain.

Moron \Mo"ron\, n. (Pedagogy)
   A person whose intellectual development proceeds normally up
   to about the eighth year of age and is then arrested so that
   there is little or no further development.

Source : WordNet®

moron
     n : a person of subnormal intelligence [syn: {idiot}, {imbecile},
          {cretin}, {changeling}, {half-wit}, {retard}]