biosphere Hear it!

biosphere definition

bio·sphere (bī′ō sfir′)

noun

  1. the zone of planet earth where life naturally occurs, extending from the deep crust to the lower atmosphere
  2. the living organisms of the earth

Etymology: bio- + sphere

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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