being without moisture; extremely dry; parched: arid land; an arid climate.
barren or unproductive because of lack of moisture: arid farmland.
lacking interest or imaginativeness; sterile; jejune: an arid treatment of an exciting topic. dull, tedious, dreary, vapid, uninspired, uninspiring; pedantic. lively, interesting, exciting, spirited, imaginative.

1645–55; (< F) < Latin āridus, equivalent to ār(ēre) to be dry + -idus -id4; cf. ash1

aridity [uh-rid-i-tee] , aridness, noun
aridly, adverb
hyperarid, adjective

1. See dry. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arid (ˈærɪd)
1.  having little or no rain; dry; parched with heat
2.  devoid of interest
[C17: from Latin āridus, from ārēre to be dry]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, "dry, parched," from L. aridus, from arere "to be dry," from PIE base *as- "to burn, glow" (see ardent). Figurative sense of "uninteresting" is from 1827.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
arid   (ār'ĭd)  Pronunciation Key 
Very dry, especially having less precipitation than is needed to support most trees or woody plants. Deserts have arid climates.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The climate is arid -- warm in the daytime, but much cooler in the evenings.
The lower parts of the country have a semi-arid or desert climate.
The moon's dry central regions are covered in rippling dunes and arid deserts.
Each unit interlocks with the next one, eliminating nailing on the exposed edge
  arid holding it down against wind and rain.
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