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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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.

1590s, from Fr. aridité, from L. ariditas "dryness," from aridus (see arid).
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
Conversely, dinosaurs are commonly found in areas that were once fluvial settings and in regions of extreme aridity.
Increasing aridity and loss of plant species may itself be contributing to the dwindling rains.
The perception of raw aridity is belied by a surprising amount of life: insects and lizards, the colorful opportunists.
Changes in the composition and the chemistry of sediments of lakes provide information on regional aridity and drought.
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