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bi·o·sphere (bī'ə-sfîr')
n.
  1. The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life.
  2. The living organisms and their environment composing the biosphere.
biospheric bi'o·spher'ic (-sfîr'ĭk, -sfĕr'-) adj.

logo The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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