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physiological atmosphere

noun
1.

ecosphere

[ek-oh-sfeer, ee-koh-] /ˈɛk oʊˌsfɪər, ˈi koʊ-/
noun
1.
Also called physiological atmosphere. the part of the atmosphere in which it is possible to breathe normally without aid: the portion of the troposphere from sea level to an altitude of about 13,000 feet (4000 meters).
2.
Ecology. the planetary ecosystem, including all the earth's living organisms and their physical environment; biosphere.
Origin
1950-1955
1950-55; eco- + sphere
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for physiological-atmosphere

ecosphere

/ˈiːkəʊˌsfɪə; ˈɛkəʊ-/
noun
1.
the planetary ecosystem, consisting of all living organisms and their environment
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for physiological-atmosphere

ecosphere

n.

1953, the region around a star where conditions allow life-bearing planets to exist; see eco- + sphere. Apparently coined by German-born U.S. physician and space medicine pioneer Hubertus Strughold (1898-1986).

Online Etymology Dictionary, © 2010 Douglas Harper
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physiological-atmosphere in Science
ecosphere
  (ē'kō-sfîr')   
The regions of the Earth that are capable of supporting life, together with the ecosystems they contain; the biosphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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