Definify.com
Webster 1913 Edition
Oasis
O′as-is
(ō′ȧ-sĭs or ō̍-ā′sĭs; 277)
, Noun.
pl. 
Oases 
(-sēz)
. [L., fr. Gr. 
ὄασις
; cf. Copt. ouahe
.] A fertile or green spot in a waste or desert, esp. in a sandy desert, where the water table approaches the surface. 
[wns=1] 
“The Arab does not love the desert; the Arab loves the oasis  
and green fields.”My one 
Of city life.
oasis 
in the dust and drouthOf city life.
Tennyson.