noun, plural oases [oh-ey-seez] .
a small fertile or green area in a desert region, usually having a spring or well.
something serving as a refuge, relief, or pleasant change from what is usual, annoying, difficult, etc.: The library was an oasis of calm in the hectic city.

1605–15; < Late Latin < Greek óasis (Herodotus) < Egyptian wḥʾt oasis, oasis region

oasitic [oh-uh-sit-ik] , oasal, oasean [oh-ey-see-uhn] , adjective

2. haven, harbor, retreat, shelter.
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World English Dictionary
oasis (əʊˈeɪsɪs)
n , pl -ses
1.  a fertile patch in a desert occurring where the water table approaches or reaches the ground surface
2.  a place of peace, safety, or happiness in the midst of trouble or difficulty
[C17: via Latin from Greek, probably of Egyptian origin]

Oasis (əʊˈeɪsɪs)
trademark a block of light porous material, used as a base for flower arrangements

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

1613, from Fr., from L.L., from Gk. oasis, probably from Hamitic (cf. Coptic wahe, ouahe "dwelling place, oasis," from ouih "dwell"). The same Egyptian source produced Arabic wah.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
oasis   (ō-ā'sĭs)  Pronunciation Key 
Plural oases (ō-ā'sēz)
A small area in a desert that has a supply of water and is able to support vegetation. An oasis forms when groundwater lies close enough to the surface to form a spring or to be reached by wells.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
  1. Obstetric Anesthesia Safety Improvement Study

  2. On-Line Asperger Syndrome Information and Support

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Tidy, well-regulated shops would line the streets, with trees and parks as
  green oases between them.
Several oases in the volatile south-west have been under a tight security
  regime for more than three years.
So skip the open-air furnace on the valley floor and visit two of the park's
  only oases.
There was no central urban planning and the result is a city of oases, each
  divided from the other by lanes of traffic.
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