biosphere

Definition

noun, plural: biospheres

(1) The part of the earth where living things exist.

(2) The part of the earth (or planet) that is capable of supporting life.

(3) The living things and their environment.

(4) All of the ecosystems of the earth.

Supplement

Biosphere encompasses all living things living in the lithosphere, atmosphere and hydrosphere.

Word origin: bios- meaning life + sphere