Hypertext Webster Gateway: "Sonoran"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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