The Collaborative International Dictionary of English v.0.48:

Moron \Mo*ron"\ (m[-o]*r[=o]n"), 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.
   [Webster 1913 Suppl.]