a small fertile or green area in a desert region, usually having a spring or well.
2.
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.
n. a place to buy liquor. : Let's go into this oasis here and pick up a few bottles.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
oasis
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.