Webster's Revised Unabridged Dictionary · 1913

Oasis

Oasis (ō"ȧ*sis or o*ā"sis; 277) , noun

[Latin, from Greek 'o`asis; compare Copt. ouahe.]

A fertile or green spot in a waste or desert, esp. in a sandy desert, where the water table approaches the surface.
The Arab does not love the desert; the Arab loves the oasis and green fields.
2.
Any refuge from a prevailing stressful, unpleasant, or annoying situation. [figurative]
My one oasis in the dust and drouth Of city life. — Tennyson