Oʹasis
. A perfect oʹasis. A fertile spot in the midst of a desert country, a little charmed plot of land. The reference is to those spots in the desert of Africa where wells of water or small lakes are to be found, and vegetation is pretty abundant. (Coptic word, called by Herodotos auasis.)
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.