Sonoran

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Sonoran \So*no"ran\, a. (Biogeography)
     Pertaining to or designating the arid division of the Austral
     zone, including the warmer parts of the western United States
     and central Mexico. It is divided into the
  
     {Upper Sonoran}, which lies next to the Transition zone, and


        the
  
     {Lower Sonoran}, next to the Tropical.
        [Webster 1913 Suppl.]