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Noun: aridness  er-id-nus or a-rid-nus [N. Amer], a-rid-nus [Brit]
  1. Extreme dryness, especially due to lack of rainfall
    "The aridness of the region made agriculture nearly impossible";
    - aridity, thirstiness

Type of: dryness, waterlessness, xerotes

Encyclopedia: Aridness