1. A fertile tract in a desert (where the water table approaches the surface)
   "The caravan stopped to rest at the oasis"
    
2. A shelter serving as a place of safety or sanctuary
   "The small cafe was an oasis of calm in the bustling market";
   - haven

Derived forms: oases

Type of: parcel, parcel of land, piece of ground, piece of land, shelter, tract

Part of: desert

Encyclopedia: Oasis, New Mexico