aridness

from WordNet (r) 3.0 (2006)

aridness
    n 1: a deficiency of moisture (especially when resulting from a
         permanent absence of rainfall) [syn: {aridity}, {aridness},
         {thirstiness}]

from The Collaborative International Dictionary of English v.0.48

Aridness \Ar"id*ness\, n.
   Aridity; dryness.
   [1913 Webster] Ariel

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