Meaning of biosphere

bi•o•sphere

Pronunciation: (bī'u-sfēr"), [key]
— n.
  1. the part of the earth's crust, waters, and atmosphere that supports life.
  2. the ecosystem comprising the entire earth and the living organisms that inhabit it.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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