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semiarid

[sem-ee-ar-id, sem-ahy-] /ˌsɛm iˈær ɪd, ˌsɛm aɪ-/
adjective, (of a region, land, etc.)
1.
characterized by very little annual rainfall, usually from 10 to 20 inches (25 to 50 cm):
the struggle to raise vegetables in semiarid regions.
Origin
1895-1900
1895-1900, Americanism; semi- + arid
Related forms
semiaridity
[sem-ee-uh-rid-i-tee, sem-ahy-] /ˌsɛm i əˈrɪd ɪ ti, ˌsɛm aɪ-/ (Show IPA),
noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for semi-aridity

semiarid

/ˌsɛmɪˈærɪd/
adjective
1.
characterized by scanty rainfall and scrubby vegetation, often occurring in continental interiors: the semiarid regions of Australia
Derived Forms
semiaridity, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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semi-aridity in Science
semiarid
  (sěm'ē-ār'ĭd)   
Having low precipitation but able to support grassland and scrubby vegetation. Steppes have semiarid climates.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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