Biosphere Definition

bīə-sfîr
noun
The zone of planet earth where life naturally occurs, extending from the deep crust to the lower atmosphere.
Webster's New World
The living organisms of the earth.
Webster's New World
The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life.
American Heritage Medicine
The living organisms and their environment composing the biosphere.
American Heritage Medicine

The part of the Earth and its atmosphere capable of supporting life.

Wiktionary
Synonyms:

Other Word Forms of Biosphere

Noun

Singular:
biosphere
Plural:
biospheres

Origin of Biosphere

  • bio- +‎ -sphere

    From Wiktionary

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biosphere