Webster’s Revised Unabridged Dictionary · 1913
Oasis
O′as·is (ō′ȧ·sĭs or ō·ā′sĭs; 277), n.; 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.
My one oasis in the dust and drouth Of city life. Tennyson.