1. The regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
   "Scientists search for planets with biospheres that could support life";
   - ecosphere
    
2. An artificial enclosed ecosystem, typically in a large, sealed building
   "Scientists conducted experiments in the biosphere to simulate conditions on Mars"

Derived forms: biospheres

Type of: part, region

Part of: major planet, planet

Encyclopedia: Biosphere