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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.